There’s nothing that annoys users as much as repeated logon prompts.
Recently a SharePoint 2013 farm was prompting all users for logon except when logging on from the web server itself. It seems someone had changed the Web Application User Authentication setting for the web app from Claims Based Authentication to Windows Authentication.
Other areas to check:
- Add SharePoint web application to the Trusted Sites
- Clear all cached credentials. Here’s how. Go to Control Panel, User Accounts, Credential Manager, Manage Windows Credentials, and remove all relevant cached credential entries. In case old credentials are stored.
- Make sure Integrated windows authentication is enabled in IE. (Tools >> Internet Options >> Advanced >> under security, enable integrated authentication)
- Ensure IE settings for User Authentication has “Automatic Logon with current user name and password” selected