RE: RPC over HTTP

From: Val Tuckett [MSFT] (valt_at_online.microsoft.com)
Date: 03/31/04 

Date: Wed, 31 Mar 2004 23:05:48 GMT

>>It is likely that your Outlook 2003 client is detecting
>a 'fast' network
>>connection to your Exchange environment when using DSL
>or Cable, thus is
>>using TCP/IP.
>>
>>Try checking the following option - Email Accounts >
>More Settings >
>>Connection Tab > Exchange Proxy Settings:
>>'On fast networks, connect using HTTP first, then
>connect using TCP/IP'
>
>Nope. Checked that. I'm thinking that the gateways my
>cablemodem people are using are blocking something
>important. Any ideas as to what?
>

The RPC traffic is encapsulated within HTTP packets, so it is unlikely they
are blocking anything relating to this traffic (port 80).

Try hard coding your Outlook 2003 client to only use HTTP(s) using this
registry key:

HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Outlook
DWORD = RPC::DisableRpcTcpFallback
Value = 1

This will disable the failover ability of the client, so remember to
disable it once you have finished troubleshooting.

Otherwise, use the RPCPing command to verify RPC over HTTP connection
without the use of Outlook 2003. Bring up a CMD box on your client and type
the following, replacing ExchServer and RPCProxyServer with their valid
servernames.

rpcping -t ncacn_http -s ExchServer -o RpcProxy=RpcProxyServer -P
"user,domain,*" -I "user,domain,*" -H 1 -u 10 -a connect -F 3 -v 3 -E -R
none

You can read through this KB for more details and steps to verify your
setup.
     827330 How to troubleshoot client RPC over HTTP connection issues in
Office
     http://support.microsoft.com/?id=827330

Regards,
Val 

----
Val Tuckett
Microsoft PSS
This posting is provided 'AS IS' with no warranties and confers no rights.
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