I was visiting a customer today, where I was to do some configuration changes on a TMG server. Well arrived at the customer site, I was unable to RDP to any of the nodes in the TMG array.
Logging on through vcenter and running a trace on one of the nodes revealed this when the connection was attempted:
Status: A connection was abortively closed after one of the peers sent an RST packet.(0x80074e21 FWX_E_ABORTIVE_SHUTDOWN)
Rule: [System] Allow remote management from selected computers using Terminal Server
Remote management was enabled when looking in system properties, but when running a netstat on the server, I noticed that it didn’t listen on port 3389.