I have four domain controller servers, A is PDC,B、C、D is BDC, A and B can replicate with each other, C and D can do this too, whereas A and C, B and C, A and D, B and D failed in replication.
Firewall were disabled on all DC, ping from any DC can reach the others. I have excuted ipconfig /flushdns & ipconfig /registerdns command on all DC. In server C, Active Directory Sites and Services console, I force replicate in NTDS settings, replicate form C to A, got error "the naming context is in the process of being removed or is not replicated from the specified server", I check by nslookup with FQDN name in any DC, it's no problem.
Does anyone has any idea about this?