Active Directory Replication Error 1722: The RPC server is unavailable

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Error message:

1. CALLBACK MESSAGE: Error contacting server 20547b77-7bc2-486a-2cfb-9638a89d99dbd._
msdcs.xxx.com (network error): 5 (0x5):
    Access is denied.

2. SyncAll exited with fatal Win32 error: 8440 (0x20f8):
The naming context specified for this replication operation is invalid.

3. The RPC server is unavailable. 0x800706ba (WIN32: 1722 RPC_S_SERVER_UNAVAILABLE)

Scenario: 
 Repadmin Syncall command gives one of the above error
 Replication doesn't work properly.

Cause:
Such errors mostly encountered if a DC was renamed, rebuilt, re-promoted with same name and IP.

Solution:

GUID entry for the old server was mapped with Domain Controller CNAME entry in DNS records.
Replace the GUID of new server with Old in CNAME record (Find the GUID from Site & Services> Server name> NTDS Properties)
Use Elevated CMD in case of Access Denied






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