When opening a form in SharePoint 12013 that was created from Infopath 2013, I get the following error.

You do not have permissions to access a database that contains data required for this form to function correctly. An entry has been added to the Windows event log of the server.

Log ID:5566

When I go to the log files on the SharePoint server. I see the following error.

Exception Message: The form cannot connect to the data source. Login failed for user 'NT AUTHORITY\ANONYMOUS LOGON'

I am guessing this has something to do with the UDCX connection and the database.

Can anyone help me get this fixed?