Error when federated user tries to sign in to the Office 365 portal with error: 8004789A

By |2017-12-07T09:27:54+00:00May 20th, 2013|Office 365|0 Comments


Recently I was helping a customer to implement ADFS for a Office 365 deployment.

We had built a Dir-Sync server and 2 ADFS servers on the internal network. We had added 2 ADFS proxies to a DMZ network that was being published by Forefront TMG, but TMG was not doing the authentication. All the necessary ports was opened.

When testing to the Office 365 portal authentication on the internal network it completed successfully, however when testing from an external client we was receiving the following error



To resolve this issue we had to disable the “Apply link translation to this rule” on the rule where the ADFS URL is published in TMG.

All external test complete successfully afterwards.



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