We have been battling a recent Exchange deployment trying to get RPC over HTTP to work.
Client-side, I am not able to establish a connection to the Exchange server via RPC-HTTP. I have installed the certificate, configured the exchange account to point to "mail.domain.com", configured the HTTP proxy to point to the same domain, set up mutual SSL authentication (msstd:mail.domain.com), enabled basic authentication. When I run "outlook /rpcdiag", it prompts for login credentials twice, tries to establish a connection, and then displays an error that "the connection to Microsoft Exchange is unavailable."
I have triple-checked that the server is configured correctly and I've run the CEICW wizard multiple times. The firewall is allowing ports 80 & 443 to pass to the SBS box. OWA works great.
The server is running Small Business Server 2003, SP2.
The workstation is Windows XP Pro, SP1 with Office 2003, SP3.
I have read countless articles for configuring RPC-HTTP including TechNet articles and troubleshooting steps. Still, I am unable to find the issue. I would really appreciate a few tips or maybe some things I've overlooked.