I run RPC over HTTP and…

When I configured RPC over HTTP in Exchange server 2003 Outlook client couldn’t run. First try to access to RPC typing


If you sucessfully authenticate and RPC over HTTP run, you get messg:

HTTP Error 403.2 - Forbidden: Read access is denied

RPC over HTTP required on client side (with Windows XP Service Pack 1) hotfix KB331320. Next when you configure e-mail profile, in “Exchange Server Settings”, in “Connection”, in “Exchange over the Internet”, in “Exchange Proxy Settings”, in “Connection settings” type URL of RPC-proxy server. Next in “Connect using SSL only”. Next in “Mutually authenticate the session when connecting with SSL” type “MSSTD:Public_FQDN_of_Server“. And in “Use this authentication when connecting to my proxy server for Exchange” select “Basic Authentication”. You can test settings with tool “RPCDump” to determine whether server listening on ports 6001, 6002 and 6004. If not, in Registry path


add value

NSPI interface protocol sequences=ncacn_http:6004

Next you can see real-time connection information when you run Outlook with following parameter

outlook /rpcdiag

This is described in KnowledgeBase under KB827330

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