I have created a server publishing rule in TMG 2010 (version 7.0.8108.200) to allow remote desktop connections from outside of our domain to connect to a terminal server within our domain (using port 3389). The rule works perfectly for a while, but after a period of time (usually a few hours) these users complain that they cannot connect. The only way that I have found to get the rule to allow these connections again, is to disable and then enable the rule. After enabling the rule, users are able to connect once more with about 1 minute to 2 minutes. Any suggestions would be appreciated.