Fix 0X80110450: COM+ partition error on base partition only
Got this error when trying to create or configure a COM+ partition? It means you're already on the base partition—here's the real fix.
When this error hits
You're in Component Services, right-clicking on COM+ Partitions to create a new partition, or maybe you're trying to set partition properties. Then pop—"COMADMIN_E_BASE_PARTITION_ONLY (0X80110450) - This function is valid for the base partition only." Happens a lot on Windows Server 2016 or 2019 when someone's running a legacy app that needs isolated COM+ environments. I saw this last week with a client running an old ERP system—they'd set up partitions for test and prod, then got stuck here.
Root cause
COM+ partitions let you run multiple versions of the same app side by side, but they work on a specific partition structure. The base partition is the default one, and some actions—like creating a new partition—can't be done while you're already inside it. The error's telling you: "You're already on the base partition, dummy—you can't do that operation here." Usually means you're clicking in the wrong place in the Component Services snap-in, or the partition service isn't running properly.
Fix it in 3 steps
Skip the registry tweaks—those won't help here. The real fix is straightforward:
Step 1: Right-click on the right node
Open Component Services (dcomcnfg), expand Component Services > Computers > My Computer. Now expand COM+ Partitions—you'll see either "Base Partition" or "Installed Partitions" listed below. You need to right-click on the COM+ Partitions folder itself (the parent node), not on "Base Partition" or any partition under it. If you right-click on Base Partition, you'll get this error every time. Select New > Partition from the folder's context menu.
Step 2: Check the partition service
If the right-click doesn't show "New Partition" or you still get the error, the COM+ Partition Service might be stopped. Run this as admin from Command Prompt:
sc query COMSysAppLook for STATE—should read RUNNING. If it's STOPPED, start it:
net start COMSysAppThen restart the COM+ System Application service too—that's the one that handles partition stuff. In Services.msc, find COM+ System Application, right-click, select Restart.
Step 3: Enable partitions if they're disabled
Sometimes partitions get disabled at the machine level. In Component Services, right-click My Computer, choose Properties, go to the Options tab. Under COM+ Partitions, make sure Enable COM+ Partitions is checked. Also check Enable Partition Service if it's there on your Server version. Apply, OK, then right-click the COM+ Partitions folder again—this time the New Partition option should work.
Still stuck?
If the error persists, verify you're not trying to modify the base partition itself—you can't rename or delete it. Also check that you're logged in as an admin (not just a power user). On domain controllers with Windows Server 2012 R2 or earlier, COM+ partitions aren't supported at all—that's a painful limit. Finally, if you're running the Component Services snap-in remotely, partitions won't show up—you have to do this locally on the server. Had a client chase that one for two hours.
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