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When I add a user to the Web Application Policy screen some additional random characters are added in front of the Domain.

I cannot remove the users and changing the permissions on a user with the junk characters doesn't seem to apply to the databases consistently.

These are both Service Accounts.

Web Application Policy Screenshot

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up vote 12 down vote accepted

This is a claims token for Windows Authentication. SharePoint 2013, unlike 2010, uses Claims as default authentication type!

More here:

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To add to this, here is some information on the claims encoding values: – Trevor Seward Apr 16 '13 at 18:43
Great! Wrote the answer from my cell, so had no possibility to add a link. – Robert Lindgren Apr 16 '13 at 18:48

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