This article helps to troubleshoot error - The server cannot bind to the server port.

The "Paragon Active Assurance Error: The server cannot bind to the server port" message indicates that the Netrounds server application is unable to secure the required TCP/IP port for its operation. This typically occurs for one of the following reasons:

• Port in Use:
• Another application or service is already using the port that Netrounds is configured to use. This is the most common cause.
• Insufficient Permissions:
• The user account running the Netrounds server does not have the necessary permissions to bind to the specified port. This is particularly relevant for privileged ports (e.g., ports below 1024) on Linux/Unix systems.
• Firewall Blockage:
• A firewall (either local or network-based) is preventing the Netrounds server from binding to the port.
• Incorrect Configuration:
• The Netrounds configuration file specifies an incorrect or unavailable port.

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• Suspects are using a port already in use by the NETROUNDs.. try changing the server port in the edit config. 
  • Default: 7000.

Refer :: https://cns.paa.juniper.net/static/4.4.3.41/support/task-types/transparency/path-mtu.html#transp_path_mtu