The directory server has detected that the service account used to run this service has been changed. The directory server ...

The directory server has detected that the service account used to run this service has been changed. The directory server has updated the internal structures accordingly. 
 
This directory server may be unable to replicate in changes from other instances, until the service account change is replicated around. 
 
User Action 
If mutual authentication is required for replication in this configuration set, then it may be necessary to unregister the SPNs from the old service account, and register the SPNs for the new service account.