Symptom
Microsoft Office and SharePoint keeps asking for a password 3 or 4 times before opening a document in both Windows 7 and Vista. This tends to happen only once until you have opened a document in the SharePoint site .
Resolution
To resolve this issue please perform the following
- Locate and then click the following registry subkey:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\WebClient\Parameters
- On the Edit menu, point to New , and then click Multi-String Value
- Type AuthForwardServerList , and then press ENTER
- On the Edit menu, click Modify .
- In the Value date box, type the URL of the server that hosts the Web share, and then click OK
- Note You can also type a list of URLs in the Value date box. For more information, see the "Sample URL list" section in this article.
- Exit Registry Editor.
Note You have to restart the WebClient service after you modify the registry or restart the PC if this is easier.
Sample URL list
The following is a sample URL list:
https://secure.yourofficeanywhere.co.uk
http://customerportal.yourofficeanywhere.co.uk
http://*.yourofficeanywhere.co.uk
*.yourofficeanywhere.co.uk
This URL list enables the WebClient service to send credentials through the following channels.

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