You should only change the server port number if the default port number clashes with another port in use on your server. The default port number (3697) is registered with the Internet Assigned Names Authority (IANA) for use by the JetStream License Server, so is unlikely to clash with other services.
To change the default port number that the server uses to serve its JetStream licenses, do the following:
Make sure that no JetStream clients are connected to the server.
Stop the NavisWorks Licensing service from the Services dialog (from Administration Tools) on the server.
Open the NavisWorks License Manager and choose Network server from the License Wizard menu.
You should now be able to change the Port Number
Click Finish to save the new Port number, or Cancel to return to the License Manager.
Restart the NavisWorks Licensing service from the Services dialog (from Administration Tools) on the server.
Make sure that any client PCs accessing licenses from the server now have the same port number that the server is using. This is changed from the client PC, again from the Network Server dialog under the License Wizard menu in the NavisWorks License Manager.