My outlook clients randomly disconnect. I verify the server is working by using outlook web app. When I go into mail properties and check the https connection it puts a * for the host name (eg *.domain.com). so the host name becomes unresolvable. If I click ok to the screen it says invalid configuration error. I have to change it to the fqdn to ok.
If I change it and reopen outlook it connects. When I close outlook and reopen again it does not connect. it goes back to the same configuration.