Forcing Outlook 2003 to use RPC over HTTP

Connecting to Exchange server via RPC over HTTP may seem to work on a corporate network yet fail when connecting from an external network.

When configuring the usage of RPC over HTTP system administrators may test the configuration on their corporate network. Outlook may succesffuly connect even if the Outlook is configured incorrectly since Outlook will fall back to connecting by using RPC over TCP.

To disable Outlook’s ability to fallback to using RPC over HTTP create the following value:
Value Name: DisableRpcTcpFallback
Data: 1
Path: HKLM\Software\Microsoft\Office\11.0\Outlook

2 thoughts on “Forcing Outlook 2003 to use RPC over HTTP

  1. Actually, the correct key should be HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Outlook\RPC, not Office\11.0\Outlook. A value of 1 causes Outlook not to fallback from whatever was the initial protocol, whether it’s HTTP or TCP/IP.

  2. hi, thank you for this information.

    ERIK,
    Could you describe the way in which to do this?

    I can’t play trial and error here, b/c I know that can cause damage to my system, and I am , after all, an amateur.

    From what I understand, this is what I do…

    Open Run from the start menu
    type: regedit, press>enter
    go to: HKEY_CURRENT_USER
    THEN TO: SOFTWARE>MICROSOFT>OFFICE>11.0>OUTLOOK
    After that I do Not see the file ‘RPC’?

    Here IS what I do see though.

    Dispaly types
    office explorer
    options
    preferences
    scripting
    security
    setup
    SQM
    UserInfo

    Do you know what I should do in this case?

    Assuming I do find this RPC file Later,
    Do I go Edit>new>dword value
    type: DisableRpcTcpFallback
    Data Value: 0?

    I have also heard of
    type:defConnectOpts
    Data Value: O

    I am Lost , can you Help?
    Thank you in advance.

    brian
    Running Outlook 2003 on XP
    brionfij@gmail.com

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