Fix RPC_NT_NO_MORE_ENTRIES 0XC0030001 (RPC Auto-Handle Binding)

You're mid-deployment, running a PowerShell script that queries WMI on a remote machine, and suddenly it throws 0XC0030001 — The list of RPC servers available for auto-handle binding has been exhausted. Or maybe you're seeing it in the System event log after a DCOM application fails to start. Either way, it's a nasty one because the error message doesn't point you anywhere obvious.

This error shows up most often when a client machine tries to make an RPC call that uses automatic binding — that's when the RPC runtime picks a server endpoint dynamically. It's common with WMI queries, some DCOM objects, and even certain Exchange or SQL tools. The trigger? Usually a misconfigured firewall, a dead DNS record, or the RPC services on the target machine just stopped responding.

Root Cause in Plain English

RPC needs to find servers that can handle the call. Think of it like a phone directory — when you auto-bind, the client asks the endpoint mapper (running on port 135) for a list of available endpoints. If that list comes back empty or the mapper can't be reached, you get 0XC0030001.

The culprit is almost always one of these:

RPC services not running — Remote Procedure Call (RPC) and RPC Locator are stopped or disabled.
Windows Firewall or third-party firewall blocking port 135 or the dynamic RPC ports (49152–65535).
DNS is broken — the client can't resolve the target hostname, so the RPC lookup fails.
The endpoint mapper itself is overloaded or hung — happens on busy servers with thousands of RPC connections.

Don't bother checking the registry or chasing exotic DCOM permissions first. Nine times out of ten, it's a service or network issue.

How to Fix It

Here's the process I use. Start at step one and work through — don't skip ahead unless you're sure.

Verify RPC services on the target machine. On the remote server, open Services (services.msc) and check these three services are set to Automatic and running:
Remote Procedure Call (RPC)
RPC Endpoint Mapper (also part of RPC service)
Remote Procedure Call (RPC) Locator — note: this one is often disabled by default, but some legacy apps need it. If it's disabled, set it to Manual and start it.
Test connectivity to port 135. From the client, run:
```
Test-NetConnection -ComputerName  -Port 135
```
If it fails, that's your answer. Check Windows Firewall rules on the target. If you use a third-party firewall (like Symantec or McAfee), make sure it's not blocking RPC. You also need to allow dynamic ports — Windows uses 49152–65535 by default. If you've tightened that range, verify it matches.
Check DNS. Ping the target by hostname and see if it resolves to the right IP. If DNS is stale, flush it:
```
ipconfig /flushdns
```
Then try again. If the hostname is wrong, fix the DNS record or use the IP directly in your RPC call.
Reboot the target machine. I know it sounds dumb, but RPC services get into weird states. A clean boot clears hung endpoint mapper entries. I've seen this fix it when everything else looked fine.
If you're hitting this on a specific application, check DCOM configuration. Run dcomcnfg and look at the component's settings. Make sure the identity is set correctly (e.g., The launching user) and that the component's RPC settings allow remote connections.

What If It Still Fails?

You've checked services, ports, DNS, and rebooted, but the error persists. Here's what to look at next:

Check WMI specifically. If your RPC call is actually WMI, run winmgmt /verifyrepository on the target. If it says corrupt, rebuild it with winmgmt /salvagerepository. WMI's own RPC endpoints can get messed up after a bad update.
Look at the endpoint mapper's log. In Event Viewer, filter the System log for Event ID 4311 or 4321 — those are RPC-related. They'll often tell you which interface failed to register.
Check if a recent Windows update changed RPC behavior. I've seen patches like KB5034441 cause RPC issues on Server 2019. If the error started after an update, uninstall it temporarily and test.
Use Wireshark or netmon. Filter on port 135 and see if the client gets a response. If the request goes out but no response comes back, the target's endpoint mapper is stuck. A reboot is the only fast fix.

One last thing — if you're running this in a cluster or load-balanced environment, make sure the RPC call is going to the correct node. I've spent hours chasing this error only to find the script was hitting a dead node IP. Check the actual network path before you blame the OS.

That's it. Most of the time, it's a firewall rule or a service that's been stopped. Get those sorted and you'll clear 0XC0030001 without breaking a sweat.