We have more than a dozen windows 2012 R2 servers, while only one of them giving Event ID 4015 out of random. Each time, 3-4 events came together the same time with nothing much in the details except the below 0000200E: SvcErr: DSID-020807EF, problem 5001 (BUSY), data -1102 After searching through forums, I could find the below 0000200E | ERROR_DS_BUSY SvcErr: DSID-020807EF | Might be related to LDAP Admin limits problem 5001 (BUSY) | Server is busy But didn't found any reasons so far. The other part of the same server from where replication happening over IP didn't show any signs of being busy at the particular time when error came. DCDIAG comes clean and there are no warning logs in events either. Any help would be useful.