The two ports used by Volume License Manager are the Licensing Port (27000 by default) and the Communication Port (4637 by default). The next step in troubleshooting is to ensure that NI License Manager (NILM) can communicate with the Volume License Server through those ports. An easy way to test this is to use Telnet.
Note: For some versions of Windows, the Telnet client is disabled by default. You may turn it on by navigating to Start»Control Panel»Programs»Programs and Features when your view is set to category and selecting the link to Turn Windows features on or off. In this window check the Telnet Client box. See the screenshot below for more information on this setting.
This means that something between the client and the volume license server is blocking the TCP communication. The most common cause is a firewall. It’s recommended to work with an IT team (if applicable) to resolve this issue.
The ports used by NI License Manager to communicate with Volume License Manager on the Volume License Server should be open and should allow for interaction between NI License Manager and Volume License Manager. Next, check NI License Manager (NILM) and Volume License Manager (VLM) configuration and connectivity .
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