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SharePoint suddenly unable to login - starts multiple credential prompts - able to login on premise however.

Last Modified: 2015-03-17
Suddenly we are unable to login to SharePoint externally to our network.
Internally it works fine.
What could this be?
We had a similar issue at the same time with another server, our ADFS server.
It did the same but wouldn't allow login either on or off network.
I set ADFS to forms-based authentication and it now works but I don't have a root cause.
These must be related to SharePoint, correct??

Thank you for your help in advance!
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