When you try to connect to the Site Administration page of your Microsoft SharePoint Team Services Web site, you may receive the following error message: Also, all Netscape Navigator users and some Microsoft Internet Explorer users cannot access the Microsoft SharePoint Team Services Web site.

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This problem may occur if either or both of the following conditions are true:

•	The virtual server or virtual directory is configured to use Integrated Windows authentication (formerly called NTLM or Windows NT Challenge/Response authentication). Netscape does not support Integrated Windows authentication. You can use Integrated Windows authentication only with Microsoft Internet Explorer 2.0 or later. -or-
•	The browser is configured to use a proxy server, and the proxy server settings block access to the Web page.

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To resolve this problem, follow these steps (as appropriate to your situation).

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Method 1: Configure the Virtual Server or Virtual Directory to Use Basic Authentication in Microsoft Internet Information Services (IIS)

1.	Start Internet Services Manager, or open the Microsoft Management Console (MMC) that contains the IIS snap-in.
2.	Expand * server name, where server name is the name of the server.
3.	Right-click the virtual server or virtual directory (for example, Default Web Site) that you want to configure, and then click Properties.
4.	Click the Directory Security tab.
5.	Under Anonymous access and authentication control, click Edit.
6.	Click to select the Basic authentication (password is sent in clear text) check box.
7.	When you receive the Are you sure you want to continue? message, click Yes.
8.	Click to clear the Integrated Windows authentication check box.
9.	Click to clear the Anonymous access check box.
10.	Click OK, and then click OK.
11.	Quit the IIS snap-in

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Method 2: Configure Proxy Server Settings for the Web Browser

NOTE: The following steps describe how to configure proxy server exception settings for Internet Explorer. For information about how to configure proxy settings in Netscape Navigator, see the product documentation.

1.	Start Internet Explorer.
2.	On the Tools menu, click Internet Options, and then click the Connections tab.
3.	In the Dial-up and Virtual Private Network settings list, click the connection that you want to configure, and then click Settings.
4.	Under Proxy Server, click Advanced.
5.	In the Exceptions box, type the Uniform Resource Locator (URL) of the SharePoint Team Services Web site.
6.	Click OK, click OK, and then click OK.

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For additional information about how IIS authenticates browser clients, click the article number below to view the article in the Microsoft Knowledge Base: For additional information about how to configure Basic authentication, click the article number below to view the article in the Microsoft Knowledge Base: For more information about how to administer SharePoint Team Services, visit the following Microsoft Web site: For more information about SharePoint Team Services, visit the following Microsoft Web site: The third-party products that are discussed in this article are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, regarding the performance or reliability of these products.

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