Description:
You recently just upgraded your ADFS to newer OS version. After a while you notice Event ID 345 on one of the secondary ADFS server. It said "There was a communication error during AD FS configuration database synchronization. Synchronization of the data from primary federation server to a secondary federation server did not occur". You are sure that all of the network port requirement are met.
The previous ADFS upgrade process is somehow causing the farm behavior level (FBL) on the secondary server doesn't match with the FBL on the primary server.
We need to remove the ADFS role and WID database feature on the problematic secondary ADFS server. After that try to re-install the ADFS role and finish the post configuration.
The secondary server will then use the correct version of ADFS configuration database and synchronization will works as expected.
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