We have a TMG (Forefront Threat Management Gateway 2010) server in our environment which we would like to turn off.
As soon as we try to switch the server off, Outlook switches to "Trying to connect" intermittently and in the Connection Status (CTRL+Outlook icon in system tray) we get a number of failures in the Req/Fail column. The strange thing is that not everyone encounters this issue.
Our Environment: 2 Exchange 2013 servers (on Windows Server 2012) and 1 Exchange 2010 server (on Windows Server 2008). Forefront Threat Management Gateway 2010 (on Windows Server 2008)
Any ideas as to what the issue can be and how to solve it?