Solved it. I ran a wireshark trace and found the following :-
- IS Client opens connection to InstallShield License Server Configuration port.
- IS client then opens up a second connection to a different port on the server used by Vendor Daemon: mvsn.
Solution:
- Log onto the admin tool and valid what ports are listening for the License Server Configuration and Vendor Daemon:mvsn. (might be best to lock down the ports in the admin console otherwise they will be dynamic and change if the services are restarted)
- Make sure you can telnet to these ports from the IS client.