One of my clients has recently updated their firewall to a SonicWall. Prior to the inclution of the firewall we could connect using RDP without any problem.
When we connect now we get a connection error as detailed in the title.
we connect from a glasgow office on the public ip of our client. if someone out side our office connects it works fine. inside the office we can connect using the same method to other clients without any issue. we use a watchguard firewall and on the client side they have created a rule allowing our public ip access to a server within their lan on port 3389 but still no joy. Even when 3389 is open to all our ip still has a problem connecting.