Outlook 2007 Exchange server is inaccessible outside network

Outlook 2007 Exchange server is inaccessible outside network

This problem may occur if the Outlook 2007 client computer does not have a default gateway configured.

If you cannot configure a default gateway for your network settings, you can work around this problem by adding a DWORD value that is named DefConnectOpts to the following registry subkey:

HKEY_CURRENT_USERSoftwareMicrosoftOffice12.0OutlookRPC

Let me fix it myself

Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly.

Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it.

Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:

322756  How to back up and restore the registry in Windows

To add this DWORD value yourself, follow these steps.

Outlook 2007

Click Start, click Run, type regedit in the Open box, and then click OK.

Locate and then click the following subkey:

HKEY_CURRENT_USERSoftwareMicrosoftOffice12.0OutlookRPC

On the Edit menu, point to New, and then click DWORD Value.

Type DefConnectOpts, and then press ENTER.

Right-click DefConnectOpts, and then click Modify.

In the Value data box, type 0, and then click OK.

Exit Registry Editor.

Outlook 2010

Click Start, click Run, type regedit in the Open box, and then click OK.

Locate and then click the following subkey:

HKEY_CURRENT_USERSoftwareMicrosoftOffice14.0OutlookRPC

On the Edit menu, point to New, and then click DWORD Value.

Type DefConnectOpts, and then press ENTER.

Right-click DefConnectOpts, and then click Modify.

In the Value data box, type 0, and then click OK.

Exit Registry Editor.