DNS_ERROR_DP_FSMO_ERROR (0X000026B2) fix for AD partitions
This DNS error kills AD directory partition operations. You'll see it when trying to create or delete application partitions. Fix is simple: check FSMO roles or force transfer.
What's this error? (and when you'll see it)
You're trying to create or delete an application directory partition in Active Directory — maybe you're setting up DNS zones or a custom partition for your app. Then boom: DNS_ERROR_DP_FSMO_ERROR (0X000026B2). The machine says the operation failed because the FSMO role holder for the domain-naming role isn't available or isn't responding.
I had a client last month whose DNS admin tried to add a new zone for their branch office. They kept hitting this error. Turned out the old domain controller holding the FSMO role had been offline for weeks after a power surge. Nobody noticed because DNS still worked for queries. But partition operations? Nope.
Here's the troubleshooting flow. Start at the top. Stop when it's fixed.
Quick fix (30 seconds) — check FSMO role holder status
Open a command prompt as admin on any domain controller. Run:
netdom query fsmoLook at the line for Domain Naming Master. That's the domain controller that owns the role. If the server name shown is offline, dead, or unreachable, that's your problem. The error 0X000026B2 happens because the app partition operation tries to talk to that specific DC, and it can't.
Also check if the server is actually running. Ping it. If it's gone, you need to seize the role (see advanced fix). If it's alive but slow, try the moderate fix first.
Moderate fix (5 minutes) — transfer the FSMO role
This assumes the current role holder is online but maybe unresponsive for partition operations. Had this happen when a DC's network adapter had a bad driver — DNS queries worked, but RPC calls for FSMO transfer failed. Rebooting the DC fixed it temporarily, but the real solution was moving the role.
On a working domain controller, open Active Directory Users and Computers. Right-click the domain name, select Operations Masters. Go to the Domain Naming tab. Click Change and pick a different DC. Confirm.
Alternatively, use PowerShell (run as admin):
Move-ADDirectoryServerOperationMasterRole -Identity "NewDCName" -OperationMasterRole DomainNamingMasterReplace NewDCName with the server you want to take over. If it works, retry your original partition operation. Should go through now.
Advanced fix (15+ minutes) — seize the FSMO role when the old DC is dead
If the old role holder is offline forever (dead hardware, decommissioned, or you can't bring it back), you can't transfer — you have to seize. This is risky if the old DC might come back online later, because you'll have two DCs claiming the same role. Only do this if you're sure that server is permanently gone.
Open command prompt as admin. Run:
ntdsutil
roles
connections
connect to server YourWorkingDC.yourdomain.com
quit
seize domain naming master
Replace YourWorkingDC with a DC that's healthy. You'll get a warning about forcing the seizure. Type yes. Ntdsutil will force the role to the working DC. Then type quit twice to exit.
After seizure, run netdom query fsmo again to confirm the role moved. Then try your partition operation. Should work.
Warning: If the old DC ever comes back online, it might conflict. Demote it immediately or wipe it. I've seen a case where a seized role caused replication errors for weeks because someone forgot to clean up the old DC's metadata. Use ntdsutil metadata cleanup if needed.
Still stuck? Check replication health
Sometimes the FSMO role is fine, but the DC you're running the operation on can't reach the FSMO holder because of replication problems. Run:
repadmin /showreplLook for any failed inbound or outbound replication attempts. If you see errors like 1722 (RPC server unavailable), fix the network or DNS before retrying. Firewalls blocking RPC ports (135, 49152-65535) are a common cause. Check your firewall rules.
Also verify that all DCs are using the same time source. Time skew over 5 minutes breaks Kerberos and can cause FSMO operations to fail. Run w32tm /query /status on each DC.
Final thoughts
DNS_ERROR_DP_FSMO_ERROR is almost always about a missing or unreachable domain naming master. Don't waste time rebuilding DNS or messing with zone files. Find the FSMO holder, transfer or seize, and you're done.
If you're still hitting 0X000026B2 after moving the role, check if the application directory partition itself is corrupted. Use dnscmd /EnumZones to list all zones and dnscmd /ZoneInfo to inspect specific ones. But that's rare. 9 times out of 10, it's the FSMO role.
Was this solution helpful?