Problem

Your’e working on a SharePoint box  and you keep getting prompted to login even though your machine is a domain member.

Explanation

You need to add the site to your trusted sites and allow IE to send your credentials

If you need a long-lasting solution add your SharePoint url to all of your user’s trusted sites using group policy – Adding SharePoint to “Trusted Sites” using Group Policy

Solution

• In Internet Explorer go to Tools -> Internet Options
• Select the Security and add all URLs that you might use to access the site
• On the trusted sites of the Security tab you opened above push "Custom Level"
• Select "automatic logon with current username and password" (towards to bottom)
• Close and then re-open internet explorer. 

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