You are prompted for authentication four times when you try to access a file on a WebDAV server from a computer that is running Windows Vista or Windows Server 2008
Consider the following scenario:
- On a computer that is running Windows Vista or Windows Server 2008, you try to access a file on a Web Distributed Authoring and Versioning (WebDAV) server.
- This WebDAV server is located on an external network.
- You access the WebDAV server by using a proxy server that requires authentication.
Before you can open the file in this scenario, you are prompted for authentication four times. You expect to be prompted for authentication only two times.
Note: You expect to be prompted to authenticate one time against the proxy server and the other time against the WebDAV server.
For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB954807.