I have a video server application which uses a lot of higher number TCP and some UDP ports. When we connect with the application on the local LAN it works fine. When qwe try to access it from a branch office connect by a router over a private T1 line, we get an error and the video will not play. The vendor keeps claming that we are bloking ports but there is NOTHInG in the router configuration that blocks any ports or does any filtering.
We have the same issue with VPN client connections to the local LAN (Cisco VPN client with full access to local LAN once connected).
This seems pretty straight forward. I don't see how it can be our WAN or VPN connections, but maybe I'm missing something obvious.