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Error event logs from ADSync - How to troubleshoot
First we are using the latest ADSync as of this post, 1.4.38.0. As far as we can tell nothing is broken. The only purpose of this tool is to allow Office 365 to be assigned to our domain users and ...
6100 is pretty normal, and the other two are always logged in conjunction with it.Here's the actual explanation from the documentation:
Q: Why am I seeing Events 6311 and 6401 occur after Sync Step Errors?
The events 6311 - The server encountered an unexpected error while performing a callback and 6401 - The management agent controller encountered an unexpected error - are always logged after a synchronization step error. To resolve these errors, you need to clean up the synchronization step errors. For more information, see Troubleshooting errors during synchronization and Troubleshoot object synchronization with Azure AD Connect sync