...
If changing the port number does not resolve the problem, try using the lmutil command to check the communication between License Statistics and the license server, as specified under "Inability to query license server" in License server issues.
Invalid license file path
If there are problems with a path location, you may see the following error:
"-96 Server machine is down or not responding.
See the system administrator about starting the server, or make sure that
you're referring to the right host (see LM_LICENSE_FILE environment
variable)."
To resolve this issue make sure that your license server is up and running. You should also check if your license file path points to a valid location. To do this, set an environment variable by typing:
LM_LICENSE_FILE = port@host