The AD Op Master Response monitor failed during consecutive attempts to bind or ping the domain naming operations master (also known as the domain naming flexible single master operations (FSMO) role holder).
This is more than a transient error, and it should be investigated. However, because the domain naming master is not required to be highly available, short-term outages are not necessarily a priority, and they can be deferred.
To view all the events that are generated by the AD Op Master Response monitor, open the AD MP Events view. These events provide more detailed information about the errors that occur during testing of the operations masters.