I am experiencing the exact symptoms in Microsoft KB article 940726. However, before I follow the Resolution instructions I have a couple quick questions.
First, has anyone out there followed the article and had it cause problems? If so, what? I've got a static DNS entry for the externally accessed host name. But I have a feeling I'm overlooking something.
Second question. The article covers changing the InternalURL for Autodiscover, EWS, Web-Based Offline Address Book and the UM Web service. However, in the Exchange Management Console, under Server Config\Client Access, I can see Internal and External URLs for the OWA, Exchange Control Panel, Exchange ActiveSync and Offline Address Book Distribution. Should I manually change the Internal URLs in the EMC to match the External URL?
Thanks for the help.