ATP UI shows internal error with the Synapse when enabling correlation with the SEPM DB. Whne un-checking the Synapse correlation, after a few seconds the screen refreshes. The box still shows checked with the internal error. (Note: See Error Message section.)
If the 'Internal Error' shows under the Synapse "Enable Symantec Endpoint Protection Correlation" and the SEPM DB shows a green Healthy status then perform these steps.
Note: Tier 1 please check the Internal Notes for next steps.