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Congratulations on your purchase of SolarWinds Orion NetFlow Traffic Analyzer (Orion NTA). Because you need to know both how your bandwidth is being used and who is using it, you can rely on Orion NTA to provide simple, integrated answers. Supporting NetFlow, sFlow, J-Flow, and IPFIX technologies, Orion NTA enables you to quickly trace and monitor how specific applications and types of traffic are using your network bandwidth. Orion NTA data are based on real statistics collected from your network by the proven SolarWinds Orion Network Performance Monitor. As a result, the network data and insight provided by Orion NTA are superior to the information provided by other Flow data analysis products that generate purely extrapolated data.

Upon installation, Orion NTA offers broad monitoring, charting, and reporting capabilities that are coupled with detail-driven statistics, including the following:

  • Bandwidth distribution across traffic types
  • Network device usage patterns over time
  • External traffic identification and tracking
  • Tight integration with detailed interface performance statistics
  • Class-Based Quality of Service reporting
  • Support for the Huawei NetStream protocol

These monitoring capabilities, along with easily configurable alerting, a customizable web-based interface, and robust reporting engines, make Orion NTA the easiest choice to make for monitoring your Flow-enabled network.

Notes Note: If you have applied Service Packs or Hotfixes to your product, they were delivered with readme.txt files. These files contain fixes that supercede the information found in the Release Notes.

Orion NTA Features

The following sections provide an overview of features that are available in this version of Orion NTA, including features introduced in previous versions.

New Features in this Version

Orion NTA version 3.8 includes the following new features:

  • Flow Navigator lets you quickly filter any view with any combination of filters, and save the newly-named filtered view directly to the view menu.
  • Enhanced usability and performance - Improvements include:

    • NTA unifies resources so that any resource can be placed in any view. All views support the same functionatiy; as do most resources.
    • Search by Application and Port provides exceptionally improved results that always lead to a relevant view of the data for the specified time period.
    • Account limitations are consistently respected in providing views.
    • Nested CBQoS policies are displayed correctly.
    • Huawei NetStream data can be collected and processed.
    • Selected time period remains consistent as you drill down into details.
    • Summary and node details are seamlessly integrated.
    • User interface elements load much more quickly.
    • NetFlow Service tolerates database and network issues to provide better overall stability.

  • Endpoint-centric Resources - You can place endpoint-centric resources on Network Performance Monitor (NPM) node and interface detailed views, giving you relevant traffic initiation and termination information. There are endpoint-centric versions of all standard NTA Top XX resources.
  • Autonomous Systems Resources let you view the traffic passing through autonomous sytem networks and the bandwidth-intensive conversations between autonomous systems.

Features in Previous Versions

Previous versions of Orion NTA included the following features:

Orion NTA Version 3.7:

  • Interface Alerts with Top Talker Details - A notification for any interface utilization alert automatically provides a list of the current top talkers on the network

    Note:NetFlow related Orion Advanced Alerts are enabled by default. As a result you will see alert related Top Talker information in the Orion Last Events resource. For more information, see Chapter 7 in the Orion Network Traffic Analyzer Administrator Guide.

  • New reports let you view statistics on these traffic components in 24 hour intervals:Top Conversations with Applications, Top 50 Endpoints and Top 50 Endpoints by Unique Partners
  • New resources let you more granularly view the composition of your traffic in terms of Top IP Address Group Conversations, Top Traffic Sources by Domain, and Top Traffic Destinations by Domain.
  • Enhanced usability - Improvements include application integration with Orion and interface changes that help you setup Flow collections and maintain quick, reliable access to detailed bandwidth usage information:

    • A Getting Started resource walks through setting up NetFlow collections
    • Top Conversations resource lists both hostnames and IP addresses
    • Summary views provide access to ingress/egress details on interfaces
    • Unmanaged Interface Events displays interfaces by name.
    • The Web Console displays a warning when the NeflowService service is stopped
    • Configuration Wizard adds an exeption to the Firewall when it is on.
    • A menu bar links to NetFlow related Summary views (requires Orion 10.0)

  • Improved performance - Key Top XX resources, Historical NetFlow Reports, Summary resources, and CBQoS data all load more efficiently:

    • Summary table indexing in the database and filtered querying from the application make this data more available to the user interface and reports.
    • CBQoS Poller enhancements - Orion NTA now performs its own polling, which increases both its performance and reliability.

      You can configure the polling interval or turn off CBQoS polling altogether, if needed, directly from the Web Console.

      Note:CBQoS polling functions correctly in Orion NTA 3.7 if you have nested policies. More specifically, NTA polling of CBQoS data will not fail if it encounters nested policies; but nested policies will be ignored in reporting CBQoS statistics.

    • Depending on your specific monitoring requirements, for Top Applications, Top Endpoints, and Top Conversations, you can control the efficiency with which data is presented by selecting the number of listed items for which Orion NTA holds and works with data in memory.

  • Increased enterprise scalability - Orion NTA can concurrently monitor 1000 or more NetFlow sources.
  • Now FIPS GPO compatible, Orion NTA can now be installed on Windows Servers on which Federal Information Processing Standards (FIPS) are enabled

Orion NTA Version 3.6:

  • Flow Monitoring Support for Cisco Adaptive Security Appliances (ASA) - Orion NTA can now report network traffic data from NetFlow-enabled Cisco ASA devices.
  • Advanced Port and Application Mapping - Application mappings may now be defined based on source and destination IP addresses, in addition to ports and protocols.
  • IP Address Group Enhancements - You can now create IP address groups consisting of any combintaton of individual IP addresses and IP address ranges.
  • Customizable Rate-based Charts:
    • Chart unit options now include Rate (Kbps), Percent of interface speed, Percent of total traffic, and Data transferred per interval.
    • Stacked area charts and new line charts offer options to include splines showing data trends.
  • Performance and Usability Enhancements:
    • By default on new installations, the Top Talker Optimization improves database performance by selectively capturing Flows representing the top 95% of all trafffic on your network.
    • Orion NTA is now capable of polling CBQoS data from devices that are not Flow-enabled.
    • The NetFlow Settings view has been reorganized and updated to improve the user experience.
    • Orion NTA views now provide node and interface tooltips displaying the NetFlow version currently in use.
    • The same installer file may be used to install Orion NTA on Orion Network Performance Monitor servers, Orion Additional Polling Engines, and Orion Additional Web Servers.
    • Edit Resource views have been updated to improve the user experience.
    • Charts now represent absolute percentage values more clearly.
    • An automatic page refresh setting for Orion NTA views has been included on the NetFlow Traffic Analysis Settings view.
    • The Manage NetFlow Sources view has been updated to improve the user experience.
    • An Accelerated Search by Endpoint option has been added to the NTA Settings view to enable faster endpoint searches.
    • Numerous other updates to enhance NetFlow Web Console performance and to improve Orion database access speed.
  • Other New Orion NTA Features:
    • A predefined Top XX Conversations report is now included in Orion Report Writer.
    • A Top 10 NetFlow Sources by Percent Utilization resource has been added to the Current Top 10 Lists view.
    • Changes to your Orion NTA configuration are now maintained through upgrades and repairs.

Orion NTA version 3.5:

  • Class-Based Quality of Service Resources - New resources for monitoring and reporting class-based quality of service (CBQoS) policies and metrics enable you to quickly see how your enabled CBQoS policies are handling traffic on your network.
  • Optional Ingress- and Egress-specific Monitoring - Monitor and display statistics for all traffic either entering any interface (ingress), exiting any interface (egress), or both entering and exiting any interface.
  • IP Flow Information Export Support - Orion NTA now supports monitoring devices using the developing IP Flow Information Export (IPFIX) standard for traffic analysis.
  • Unmonitored Ports Information - This version of Orion NTA provides additional data about unmonitored ports and applications.
  • Enhanced Web Console Performance - Additional options related to DNS resolution in Orion NTA resources can improve overall web console performance.
  • Flow Collection on Multiple Ports - Orion NTA now supports the collection of Flow records on multiple ports.

Orion NTA version 3.1:

  • Flow Sources May be Added Automatically - This version of Orion NTA provides the option to automatically add Flow source devices if they are already monitored by Orion NPM.
  • Accelerated Resource, View, Chart, and Graph Creation - By default, resources in previous versions of Orion NTA displayed data for the last 2 hours, and this default was not configurable. Now you can set the default resource data period to help accelerate resource and view loading as shorter data periods will result in faster chart and graph creation.
  • Scheduled Database Maintenance - Orion NTA allows you to minimize unnecessary memory usage by scheduling the time, frequency, and type of database maintenance for optimal performance.
  • Database Size Management - It is possible that Flow-enabled network devices may send data for traffic on ports that are not actually monitored by Orion NTA. With this version, you can free up valuable space in your database for the Flow data you really need by choosing to ignore traffic data from unmonitored ports.

Orion NTA version 3.0:

  • QoS Performance Views - Easily view network traffic segmented by Class of Service methods such as Type of Service or DSCP. Quantify and visualize the amount of traffic each of your Quality of Service (QoS) levels is consuming including voice and video data.
  • Personalized Traffic Views - Create and access personalized views by filtering NetFlow information for specific details such as domain traffic generated during standard office hours (8-5p) from a specific IP address excluding application data on port 514.
  • Additional flow support is now available for:
    • NetFlow v9
    • sFlow v5
    • J-Flow
  • Port Application Grouping - Assign an application which uses several network ports to a group to gauge performance for an application.
  • Network-wide resources are now available - Top XX Applications, Conversations, Endpoints, Types of Service, Transmitters, Receivers, Protocols, Countries, and IP Address Groups have all been added.
  • Fully integrated NetFlow resources within Orion views - NetFlow resources can easily be added to Orion views automatically.
  • Immediate DNS Lookup - You can now perform a quick manual DNS lookup when the scheduled DNS update feature has not updated yet.
  • Search for IP address ranges - The ability to search for IP address ranges is now available using the Search IP feature.
  • New Resource - Top XX NetFlow Source by % Utilization resource has been added.

Orion NTA Fixes

The following sections provide information related to fixes in this and previous versions of Orion NTA.

Fixes in this Version

Orion NTA version 3.8 includes the following fixes:

  • Top Conversations area chart no longer incorrect data when displaying a number of conversations that exceeds the number for which data has been aggregated in memory.
  • Scrollbar shifts position while resources load.
  • Top XX Domains load much more slowly than other Top XX resources.
  • Searches by Application/Port fail.
  • Searches by Application/Port do not respect account limitations.
  • Data for CBQoS nested policies is not processed.
  • Filtering of traffic views does not respect account limitations.
  • Account limitations set in NPM are not respected in NTA.
  • Account limitations applied to a single node cause errors in Top XX resources.
  • NetFlow Service stops when it loses connection to SQL Server database.
  • Upgrading to APM 4.0 blocks NTA license verification.
  • Top XX Endpoint resource fails to load data after upgrade from NTA 3.7 to 3.8.
  • Choosing to monitor currently unmonitored applications results in an error.
  • Graphing errors.
  • Mouse-over on interfaces shows an error.
  • NetFlow node details resource cannot be changed from Both to either Ingress or Egress.
  • New NetFlow Sources generate error messages.

Fixes in Previous Versions

Previous versions of Orion NTA have included the following fixes:

Orion NTA version 3.7

  • NetFlow service stops if the NetFlowApps table in the Orion database is missing two rows.
  • Information about devices not appropriate to active limitation filter should be excluded from dispaly in Orion NTA
  • Ports collision default configuration for RTP.
  • Slow performance for reports--7 days.
  • Sow performance for reports--30 days.
  • Non-sources show up in NetFlow Sources.
  • Historical (Netflow) reports timeout.
  • Data failing to be collapsed in Details table.
  • Discrepancy in statistics between Orion NTA Web Console and Report Writer.
  • Errors in flushing DNS cache.
  • NetFlow Service not running after installation of Orion NTA 3.6.
  • Configuration Wizards fails to import sample map and NTA Web Console display error.
  • Node and interface details cannot be displayed on an additional server's Orion NTA Web Console.
  • Some wide resources do not respect time period setting when using aggregated data.
  • Settings for Top XX table retention not preventing duplicates in NetFlowGlobalSettings table.
  • Failure to respect View Limitation leads to misleading data.
  • CBQoS errors when Orion NTA is used with Orion 10.
  • NetFlow Service does not start after upgrade from Orion NTA 3.6.
  • Customer asked for license after installing Orion NTA on additional Orion server.
  • Timeout in restarting services as part of Orion NTA installation.
  • Traffic sometimes reported for incorrect node and interface when InterFaceIndex exceeds 4096.
  • CBQoS device with nested policies causes jobscheduler exception.
  • Licensing an expired evaluation of Orion NTA is blocked.

Orion NTA version 3.6

  • Orion Web Console user accounts that are limited from using Toolset integration tools can no longer access them from within Orion NTA views.
  • Top XX resources are now sorted by traffic volume instead of NodeID or InterfaceID.
  • Typographical and formatting errors in Orion NTA views and resources have been corrected.
  • Yellow "Device Unmanaged" events no longer display in event logs if the Allow monitoring of Flows from unmanaged interfaces setting is enabled.
  • Differences in the units used in resources on NetFlow Traffic Analysis Summary and NetFlow Node Details views have been corrected.
  • Orion NTA no longer requires that Flow templates include the OUTPUT_SNMP field type (field type number 14). For more information, see What Flow template fields does Orion NTA require?
  • All SQL scripts employed by Orion NTA now directly specify the use of the dbo schema when creating new database objects.
  • Units displayed in Total Packets Transferred resources have been corrected.
  • Total Bytes Transferred resources now display correctly on the NetFlow Application view when a domain is specified.
  • The Conversation Traffic History resource has been reconfigured to more accurately represent conversation traffic volume.
  • Removing the What's New in Orion NTA resource no longer generates an Orion Website Error.
  • Orion NTA can now poll CBQoS data from devices that are not also sending Flow data.
  • A condition resulting in either empty web console views or "Specified cast is not valid" errors has been corrected.
  • Resource titles are now displayed as designed when resources are detached in Internet Explorer 6.
  • Charts generated using Progressive Charting now display the same level of detail provided by charts generated without the use of Progressive Charting.
  • Unmonitored and Random High Traffic are properly labeled on NetFlow Conversation views.
  • Search by Endpoints no longer returns an error when more than 256 Flow sources are active.

Orion NTA version 3.5

  • Chart resources now provide color icons next to each listed element to aid in mapping table data to corresponding charts.
  • Orion NTA reports sent as email messages using the Orion Report Scheduler now display correctly.
  • NetFlow version 5 packets provided by ImageStream Rebel Routers are currently received and analyzed as designed.
  • Requests to edit a device hostname using the Edit button in Endpoint Details resources no longer cause Orion Website Errors or timeouts.
  • Installations of Orion NTA on additional web servers now generate reports correctly.
  • Orion NTA resources are now automatically hidden on Orion Node Details views for nodes that are not Flow recognized sources.
  • A database migration failure issue has been corrected.
  • An error condition forcing the SolarWinds NetFlow Service to stop shortly after startup has been corrected.
  • DNS resolution in Orion NTA has been reconfigured to correct an issue that caused the SolarWinds NetFlow Service to stop with an out of memory error.

Orion NTA version 3.1

  • An issue where the web console and reports do not display data for longer time periods consisting of smaller intervals has been fixed.
  • When selecting the default network device for NetFlow Node Details and NetFlow Interface Details views, lists of valid nodes and interfaces, respectively, are now provided.
  • Orion NTA has been confirmed compatible with case-sensitive SQL Server databases.
  • Performance of the Manage Application and Service Ports view has been improved for large lists of ports and applications.
  • A performance issue due to excessive updates of the NetFlow Sources table has been fixed.
  • The Configuration Wizard no longer overwrites user-defined IP address groups if any of the IP addresses in the user-defined groups are contained within the default IP address group ( – defined for Orion.
  • Network taffic data is now properly displayed for added interfaces that were previously deleted from mnoitoring.
  • Choosing to monitor all ports now enables all disabled applications on formerly unmonitored ports.
  • Flow source IP addresses no longer overwrite source hostnames in the event of a failed DNS lookup.
  • Domain names now correctly resolve from hostnames provided with only one period, as in
  • An issue where Orion NTA performance counters were either missing or not properly created has been fixed.
  • Icons for Riverbed devices are now displayed correctly.
  • NetFlow v9 templates are now stored with the source ID field, in addition to the previously stored source IP address and template ID, to differentiate multiple Flow streams originating in the same exporter.
  • Top XX resources now properly respect the No Chart option for Resource Style on the Edit Top XX Resource view.
  • The NetFlow Sources resource no longer lists source duplicates in the event that the status of any interface on the source has been changed to Unmonitored.
  • An issue that caused some charts to display incorrect negative data values has been corrected.
  • Changing the location of the Traffic View Builder resource on the NetFlow Traffic Analysis Summary view no longer generates an error.
  • Loading of the Top XX Domains resource has been accelerated.
  • The library used by Orion NTA to perform DNS lookups has been changed to fix errors encountered with DNS resolution.
  • The Edit NetFlow Sources view has been fixed to no longer display the footer divider and text in the middle of the source list.
  • In the case that some browsers are configured incorrectly, a large "Access Denied" image has been replaced with an error message providing information to correct the browser configuration issue.
  • Views containing interface in/out percent utilization resources are no longer prevented from loaded properly when monitored interfaces provide nonstandard or invalid values for percent utilization.
  • The current version of Orion NTA properly handles sFlow packets that are neither bridged, routed, nor otherwise transmitted through any monitored interface.

Orion NTA version 3.0:

  • Resolved issue where IP Address Groups Chart would periodically show as a red "X"
  • Fixed issue where the NetFlow Sources - NetFlow "Exporters Only" option does not display all available exporters.
  • Removed limitation where users would not have rights to NetFlow views if the views were created prior to the latest NetFlow install.
  • Fixed issue where "Exception: error occurred during packet processing. Object reference not set to an instance of an object." errors would appear in the Event Log.
  • Resolved issue where the Top XX IP Address Groups resource only listed 1 group.
  • Updated Charting component to resolve issue related to dips in data.
  • Resolved an issue where Orion NTA ignored the “Keep compressed data for x days” setting and retained all compressed data resulting in a larger than desired database size.
    Note: Now that this issue has been fixed, data older than 90 days will be removed from the database after upgrading.
  • Fixed issue where in certain specific situations, the times below the graphs would repeat.
  • Restarting the NetFlow service to view NetFlow data on recently added NetFlow interfaces is no longer required.

Installing and Upgrading Orion NTA

The following sections provide required information to consider before installing or upgrading Orion NTA.

Licensing Orion NTA

Licensing for Orion NTA follows the licensing levels of your underlying Orion Network Performance Monitor installation. For more information about Orion licensing, see Licensing Orion Network Performance Monitor in the SolarWinds Orion Network Performance Monitor Administrator Guide.

The following types of NetFlow licenses are currently available.

  • Orion NetFlow Traffic Analyzer for Orion SL100
  • Orion NetFlow Traffic Analyzer for Orion SL250
  • Orion NetFlow Traffic Analyzer for Orion SL500
  • Orion NetFlow Traffic Analyzer for Orion SL2000
  • Orion NetFlow Traffic Analyzer for Orion SLX

Installing this Version


  • Before installing or upgrading any module, including Orion Network Performance Monitor, ensure you first back up your database.
  • You must first install Orion Network Performance Monitor version 10.1 or higher if you want to install this version of Orion NTA.
  • SQL Express only supported for purposes of evaluating Orion NTA; it is not supported for production instances.

You do not need to uninstall your previous version to install this version of Orion NTA. And though it is a best practice to shut down any other SolarWinds applications that are currently running, the installer software begins by automatically shutting down all relevant SolarWinds services, including services related to the following:

  • Orion Enterprise Operations Console
  • Orion IP Address Manager
  • Orion IP SLA Manager
  • Orion NetFlow Traffic Analyzer
  • Orion Network Performance Monitor
  • Orion Application Performance Monitor
  • Orion Network Configuration Manager

After the installation successfully finishes, the Configuration Wizard automatically starts.

For more information about installing Orion NTA, see Installing Orion NetFlow Traffic Analyzer in the SolarWinds Orion NetFlow Traffic Analyzer Administrator Guide.


  • If you are installing Orion NTA on a terminal server, use the Add or Remove Programs utility on you server (Start > Control Panel > Add or Remove Programs) to run the Orion NTA installer. For more information, see Installing Orion NetFlow Traffic Analyzer in the SolarWinds Orion NetFlow Traffic Analyzer Administrator Guide.
  • SQL Express and MSDE are not supported for use with Orion NTA.
  • Windows 2000 Server is no longer supported for Orion NTA installations.

Installing Service Packs

Occasionally, SolarWinds may provide service packs to address issues that arise after the release of this version of Orion NTA. Due to the nature of the database migration that this version of Orion NTA may be required to complete, if database migration is required, service packs should not be installed while Orion NTA is migrating your Orion database. Either of the following options addresses this potential conflict:

  • Ensure that both the latest service pack executable and your Orion NTA installation executable are in the same folder when you launch the Orion NTA installation executable.
  • If a database migration is required, do not apply the service pack until after Orion NTA has completed your Orion database migration and you have run the Configuration Wizard.

Upgrading Orion NTA

Consider the following:

  • In following an upgrade path from Orion 3.6, the SQL Server transaction log may grow significantly when running the Configuration Wizard for the first time after the first upgrade (NTA 3.6 to NTA 3.7). If you have SQL Server limitations on the transaction log file size, you may run into a hard limit that could potentially cause a failure.
  • To complete an upgrade from any version prior to version 3.1, you can either uninstall your current version and then install this version using a new database, or you can contact Technical Support for assistance in progressing through required installations to version 3.1 before upgrading to this version. For more information, contact support at
  • Upgrading your NetFlow installation to this version from versions prior to version 3.1 may take several hours to complete, depending on the size of your database. The upgrade process may appear to stop responding when displaying Processing NetFlowDatabaseScheme.dbConfig file. However, the upgrade is still working in the background. It is recommended that you perform the upgrade during a maintenance time period to avoid any interruptions during normal operating hours.

Additional Polling Engines and Web Servers with Orion NTA

Orion NTA should be installed and fully upgraded to this version on all Additional Polling Engines and Additional Web Servers you are currently using to monitor your network. To poll for CBQoS from an Orion server you must have Orion NTA installed on it.

After installing NTA on an additional receiver, you must restart the NetFlow Service on main NTA server.

Note: The same executable used to install Orion NTA on primary Orion NPM polling engines is used to install Orion NTA on Orion Additional Polling Engines and Orion Additional Web Servers.

Configuring NetFlow Data Export

If your NetFlow device does not use the ip route-cache flow command in its configuration file, it may use the MLS NDE SENDER command. An explanation of the process of enabling Cisco Catalyst switches for NetFlow data export is currently available in Enabling NetFlow and NetFlow Data Export on Cisco Catalyst Switches on the SolarWinds website. For more information about configuring your NetFlow device, consult the documentation provided by your device manufacturer. For more information about MLS NDE SENDER on Catalyst 4500 and 6500 switches and Cisco 7600 series routers, see Catalyst 4500, Catalyst 6500, and Cisco 7600 on the Cisco website.

NetFlow Reports and Compressed Data

If you configure an Orion NTA report to have a time period that is shorter than the period for which you have set Orion NTA to keep uncompressed data, your configured Orion NTA report will not present any data. For more information about data compression settings in Orion NTA, see Configuring NetFlow Data Compression in the SolarWinds Orion NetFlow Traffic Analyzer Administrator Guide

Improved Searching for NetFlow Sources

The NetFlow endpoint search utility was improved in Orion NTA version 2.1 for faster response times. Beginning with version 2.1, more information about individual NetFlow-enabled endpoints is stored in the Orion Network Performance Monitor database to facilitate database searches.

Selecting Views by Device Type

If you want to edit node views or assign views by type of node and you use the Views by Device Type option, ensure that you select Node Details for each of the node views that you do not want to change. With Orion NTA installed, the new default web view becomes NetFlow Node Details, which may not be the view that you want.

Unresolved IP Addresses

IP addresses that are unresolved at the time that Orion NTA is installed will remain unresolved, even after DNS can resolve them. To avoid timeout waits, Orion NTA does not attempt to resolve IP addresses to DNS names again until 2 days after the initial failure.

  • To perform a DNS lookup in realtime, click Lookup in the Endpoint Details resource.
  • To configure this DNS resolution interval, using an account with administrative privileges, click Admin > NTA Settings, and then click Edit under the Global Settings heading. Edit the Default number of days to wait until next DNS lookup for unresolved IP addresses setting, as appropriate.

Uninstalling Orion NTA

If you uninstall Orion NTA, you will need to complete the following procedure to ensure that your installation of Orion Network Performance Monitor is not negatively affected.

To safely uninstall Orion NTA:

  1. Click Start > Control Panel > Add or Remove Programs.
  2. Select SolarWinds Orion NetFlow Traffic Analyzer, and then click Change/Remove.
  3. Select Remove, click Next, and then follow the prompts to complete the uninstallation of Orion NTA by clicking Finish.
  4. Click Start > Control Panel > Add or Remove Programs.
  5. Select SolarWinds Orion Network Performance Monitor, and then click Change/Remove.
  6. Select Repair, click Next, and then follow the prompts to complete the repair of Orion Network Performance Monitor by clicking Finish.

After uninstalling, you may encounter a "Could not load file or assembly" error when accessing your Node Details or Interface Details view. To resolve this error, complete the following procedure.

To resolve the error message:

  1. Log into the web console using an account with admin privileges.
  2. Click Admin.
  3. Click Manage Views.
  4. Select the Node Details or Interface Details view that is causing the error, and then click Edit.
  5. Remove any NetFlow resources you see listed.
  6. Click Done.

Other Known Issues

The following issues may arise in your installation of Orion NTA. These are known issues that may be addressed in a future release.

  • Uninstalling an additional NTA collector leaves an entry for the collector in the database and so that collector displays in the NTA Summary view.
  • NetFlow Sources are automatically added in node discovery even though the automatic addition option is disabled.
  • Due to the way NTA uses aggregated data to calculate the Top Talker statistics, you will always be presented with 2 minutes of data less than your setting. For example, if you set the interval to cover the last 5 minutes, you will see only 3 minutes of data on the graph. A workaround is to adjust your time period at least 2 minutes beyond the point for which you want to view Top Talker data.
  • Orion NTA not receiving NetFlow from Cisco Nexus 7010. While this device supports NetFlow version 9, it can also be configured to export Netflow version 5. There are conflicts when the exporter configured to export version 5 attempts to handle data thta was polled using verion 9 that does not fit into the version 5 32-bit word size.
  • Data rate (kbps) listed on resource exceeds bandwidth of interface. This Knowledge Base article explains how to adjust the NetFlow cache timeout on the device, which prevents duplicate data exports and fixes this problem in Orion NTA.
  • The Search tool in the Manage Applications and Ports resource only supports searches of application names. However, this post on provides a workaround to get port-related information.
  • Port 7777 is used as a default port by both Oracle Database and Apple iChat applications. By default, when monitoring port 7777, Orion NTA assigns Oracle Database as the associated application. This assignment can be changed on the Manage Applications and Service Ports view. For more information, see "Configuring Monitored Ports and Applications" in the SolarWinds Orion NetFlow Traffic Analyzer Administrator Guide.
  • Applications in some Top XX Application resources are listed without corresponding assigned port numbers.
  • In some views, an account-limited user may be able to see the names of network objects they are not otherwise permitted to see. Information beyond object names is not provided, in accordance with applied account limitation definitions.
  • Some application charts printed from NetFlow <Device> Details views may not resize correctly for portrait orientation. In landscape orientation, some chart objects may overlap.
  • Unchecking "Allow monitoring of flows from unmanaged interfaces" sometimes results in less data being seen for a particular monitored interface.
  • Another NetFlow collector sometimes blocks the NetFlow Service's access to port 9996. In this case, since the NetFlow Service cannot run properly, NTA settings are inaccessible.
  • By design, since each flow has two endpoints, Top XX Endpoints show higher traffic than other resources.
  • If the server on which NTA is installed has remnants of older NTA installations (3.1, 3.5), the current installation fails to complete correctly.
  • Resources do not display Chinese characters correctly.
  • The CBQoS Pre-Policy, Post-Policy and Drops resources show 'No Data for Selected Time Period' no matter what time period is selected.
  • To function as designed, the thwack Recent NetFlow Posts resource requires access to the internet. If your Orion server is not connected to the internet, the NetFlow Traffic Analysis Summary view may timeout. To correct this issue, remove the thwack Recent NetFlow Posts resource from all Orion Web Console views. For more information, see Customizing Views in the SolarWinds Orion Network Performance Monitor Administrator Guide.
  • Some Orion NTA resources may not display correctly if the regional settings for the IIS server hosting your Orion Web Console do not match the language preference configured in the browser used to view the web console.
  • Due to limitations in the Flow packets they provide, VMware Virtual Switches are not currently supported for monitoring with Orion NTA.
  • Orion NPM and NTA sometimes show data inconsistencies.