For some reason my SharePoint site is constantly asking users to verify their credentials. Almost every time a file is downloaded (even if the user has all permissions for the file or folder), it is prompting them to log in. This problem also occurs when navigating through the SharePoint site. Does anyone know what might be causing this or a solution? I dont know if this is what might be causing the problem, but the IIS was restarted multiple times recently.

SharePoint relies on both dynamically generated content and content that is on the actual servers .. you should use a tool like Fiddler or Firebug to see what specific items are hitting 401 errors and then see if you can track down where they are coming from (typically physically). In addition, the IIS access logs will have information on what kind of 401 error you are getting. For example, a 401.3 indicates that file system permissions are to blame.

Hi, the first troubleshooting step is to check if its a machine specific issue or is happening with all the users. Most of times, its because of users IE settings. Following URL seems helpful trying to figure out the issue http://social.msdn.microsoft.com/Forums/en-US/sharepointadmin/thread/c244e7ee-ace8-4b20-afe5-711ce9405edf Hope this helps, Regards, Rohan

Hi Rohan, I looked into your post, unfortunatly this is not an IE error. This problem occurs in all browsers and when opening server files in word, excel, powerpoint, and projects.

Im going to post the answer incase anyone else has this problem in the future. Even though this site was an intranet site, it was set up as a .com site collection. The issues where multiple log-ons were added was from computers that did not have the SharePoint site as a trusted site. This did not solve the authentification prompts for documents. To solve the authentification prompts for opening office documents we added the site collection to local intranet on group policy. Because of the lower security settings, office no longer prompts for authentification when opening files. (edit: be sure to add the site site.something.com as well as http://site.something.com in order to fix issues exploring to these folders). I hope this helps anyone who comes across this same problem in the future.