On SP 2007 we are using NTLM to authenticate. I have a request to create a custom zone for one document library in a website in the site collection to use Basic Authentication. We tried everything we could think of and finally set up a zone for the entire site collection - still it does not seem to be working. Is there a way to set up Basic Auth for only 1 website in a collection?

Hello ritzz1, For SharePoint, it is not possible to setup authentication for one site. The authentication is based on web application level, not site collection or even site level. A single web application only supports a single authentication provider, such as Windows, Forms, etc. Although the content inside link below doesn't completely match your situation, but you can review it as reference since it describes the details about authentication in SharePoint: http://msdn.microsoft.com/en-us/library/bb975136(v=office.12).aspx Therefore, the only way to achieve this is to create one web application (and set the authentication method you need on it), then use this web application to host only one site collection, and use this site collection to host only the site you need to use the authentication method...Obviously, this method seems not worthy to use since it is only one document library in a site needs to use the authentication. However, it is better than nothing:-) Hope this help:-) Best Regards, Roy