Microsoft KB Archive/831060

= You cannot connect over the Internet to Exchange Server 2003 from Outlook 2007 or from Outlook 2003 =

Article ID: 831060

Article Last Modified on 1/24/2007

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APPLIES TO

 Microsoft Office Outlook 2003, when used with:  Microsoft Exchange Server 2003 Enterprise Edition

 Microsoft Exchange Server 2003 Standard Edition  Microsoft Office Outlook 2007

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Important This article contains information about how to modify the registry. Make sure that you back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows registry



SYMPTOMS
When you try to use Microsoft Office Outlook 2007 or Microsoft Office Outlook 2003 to connect over the Internet to your mailbox on a Microsoft Exchange Server 2003 based-computer, you are prompted for your logon credentials many times, and you do not connect to Exchange Server 2003.

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CAUSE
This behavior occurs if an outbound proxy authentication is required, and if you use Remote Procedure Call (RPC) over HTTP to connect to an Exchange Server 2003 account. When Outlook is using RPC over HTTP, the default timeout is 45 seconds. If RPC over HTTP takes longer than 45 seconds to connect, the connection is not successful.

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RESOLUTION
Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall the operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.

To resolve this behavior, you can add the ConnectTimeout, the ConnectTimeoutLow, and the RFRTimeoutDWORD values to the RPC registry key. To do this, follow these steps.

Note All the &quot;connect timeout&quot; registry values that are mentioned in the following steps are expressed in milliseconds (ms). <ol> Click Start, and then click Run.</li> In the Open box, type Regedit, and then click OK.</li> Expand the following registry key:

Outlook 2003

Outlook 2007

</li> Right-click RPC, point to New, and then click DWORD Value.</li> Type ConnectTimeout, and then press ENTER to name the new value.</li> Double-click ConnectTimeout.</li> In the Value data box, type 000493e0, and the click OK.</li> Right-click RPC, point to New, and then click DWORD Value.</li> Type ConnectTimeoutLow, and then press ENTER to name the new value.</li> Double-click ConnectTimeoutLow.</li> In the Value data box, type 000493e0, and the click OK.</li> Right-click RPC, point to New, and then click DWORD Value.</li> Type RFRTimeout, and then press ENTER to name the new value.</li> Double-click RFRTimeout.</li> In the Value data box, type 000493e0, and the click OK.</li> Exit Registry Editor.</li></ol>

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MORE INFORMATION
When Outlook tries to connect to each server type, Outlook uses the registry values that you added in the Resolution section to determine how long to wait before the connection is considered a failed connection (a time-out connection) and the connection is dropped.
 * Outlook uses the ConnectTimeout registry value when it detects connections that use a network adaptor that is functioning at greater than 128 kbps.
 * Outlook uses the ConnectTimeoutLow registry value when it detects connections that use a network adaptor that is functioning at less than 128 kbps.
 * Outlook uses the RFRTimeout registry value for a server referral. For example, Outlook uses this value when it asks the Exchange store for a referral to the global catalog server, to another user’s mailbox, or to a public folder. Outlook uses this registry value for all network adaptor speeds that are detected.

Outlook uses these registry values to determine how long to wait for a connection to succeed before Outlook times out and the connection fails.

Additional query words: OL2003 OL2007

Keywords: kbpending kbprb KB831060

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