Consideration when choosing ports for transport adapters

Summary:
Service providers, especially wireless providers, are more frequently blocking traffic based on destination port. This article explains what you should consider when choosing ports used for transport adapters.

Details:
Any standard port number can be used as either the Local Port or the Gateway port for transport adapters in the TotalRoam Client. However, because service providers may block traffic by destination port, you should use Echo Test to confirm that the port(s) you plan to use will not be blocked.

Also note that the default Local Port for TotalRoam Client transport adapters is 0. That means that TotalRoam will use an ephemeral port given to it by Windows as the source port of the VPN tunnel. If Windows gives TotalRoam a port that is blocked by your service provider, the Gateway will receive key exchange packets, but the acknowledgements it sends will not reach the Client. To guarantee that TotalRoam does not use a port blocked by your service provider, set the Local Port on your transport adapters to a port that is known to work. In general, it's a good idea to set it to the match the port used in the IP/Port Gateway setting.