I use Outlook 2007 with Exchange 2003 SP2, and yesterday RPC over HTTP just stopped working all of a sudden. I started getting Security Alerts for autodiscover, pointing to myregisteredsite.com. So I changed our DNS so there were no wildcards thinking this would help. I even removed the split-DNS our server was using just to see if it made a difference, but it hasn't helped. The server is SBS Standard with SP2.
I've run the Internet Connection Wizard several times, removed and replaced the Outlook profile, removed and replaced the cert, which is a 3rd party cert from GoDaddy, and I get as far as /rpcdiag showing the Directory connecting fine with HTTPS but the Mail or Public Folders not showing up at all.
What could have happened to cause this mess?