To run the SSLVPN on a different port from the default 4433, you can follow these steps:
Note: If you want to use port 443, you have to first change the Management Port (System | Administration | HTTPS Port:)
After this change, you will be able to connect to the SSLVPN using NetExtender or the web browser or Mobile Connect on the port you specified in SSLVPN Port.