![]() ![]() ![]() Check if the correct DNS servers’ IP addresses are specified in the DC network connection settings. Or: Test-NetConnection lon-dc01 –port 135Ī common source of such problems is the incorrect DNS configuration on the DC. You can do this using telnet or the PowerShell Test-NetConnection cmdlet: telnet lon-dc01 135 Now check if TCP port 135 (RPC locator) on the domain controller returning error 1722 is in the listening state. Then check the permissions on the NETLOGON and SYSVOL folders, and check the availability of TCP 135/445 ports, maybe they are blocked by the firewall. If they are in different physical locations, check if the link between them is up. If the RPC client and server are on different networks, make sure traffic is properly routed between them. If they are not available, use the built-in ping and tracert tools to test basic network connectivity between the RPC client and server: ping lon-dc01 ![]() This means that to make changes from dc02 to dc01, it is required that dc02 should be the replication partner of the dc01.įirst of all, to verify that everything is fine with replication, you need to make sure the UNC path \\lon-dc01 (this is a problematic DC that returns error 1722 RPC server unavailable) is accessible, and the SYSVOL and NETLOGON folders are shared. Each domain controller periodically writes changes that occurred on other domain controllers (replication partners) to its local AD database (ntds.dit file). Replication (Synchronization) Active Directory is a fully automated process. Now let’s say a few words about how replication works in an Active Directory domain. ![]()
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