RPC_S_NO_INTERFACES (0x00000719) Fix: The Real Causes

You're staring at RPC_S_NO_INTERFACES (0x00000719) and wondering why your app won't talk to the server. I've hit this more times than I can count, and the culprit is almost always something dumb—a service that didn't start, a firewall rule that's too strict, or a DCOM registration gone stale.

Let's cut to the chase. This error literally means the RPC runtime can't find any interface to connect to on the target machine. It's not a network issue—it's a configuration or service issue on that box. Here's the order I fix it in.

1. The RPC Services Aren't Running (Most Common)

First thing I check: is the Remote Procedure Call (RPC) service actually running? And its dependencies? On Windows Server 2012 R2 through 2022, I've seen the RPC service get disabled by a poorly applied GPO or after a botched update.

Open an elevated PowerShell or cmd and run:

sc query RpcSs
sc query RpcEptMapper
sc query DcomLaunch

All three should show RUNNING. If any are STOPPED, start them:

sc start RpcSs
sc start RpcEptMapper
sc start DcomLaunch

If they won't start, check the Event Viewer for errors. I once chased this for an hour only to find the RPC Endpoint Mapper service was set to Disabled in the registry. Fix that:

reg add "HKLM\SYSTEM\CurrentControlSet\Services\RpcEptMapper" /v Start /t REG_DWORD /d 2 /f

Then restart. Don't bother rebooting unless you have to—service start is enough.

2. Firewall Blocking RPC Dynamic Ports

Second common cause: Windows Firewall (or a third-party one) is blocking RPC's dynamic port range. RPC uses port 135 for the endpoint mapper, but then it grabs random ports in the range 49152–65535 for actual communication. If those are blocked, you get 0x00000719 because the client can't reach the interface.

On the server that's hosting the RPC service, check if the firewall is blocking. In an elevated prompt:

netsh advfirewall firewall show rule name=all | findstr "135"

You need an inbound allow rule for TCP 135 and the dynamic range. If you don't have one, add it:

netsh advfirewall firewall add rule name="RPC Dynamic Ports" dir=in action=allow protocol=TCP localport=49152-65535

But here's the thing—if you're in a domain environment, your GPO might be overriding local rules. Check the Effective Policy with gpresult /h policy.html and see if any firewall rules are being enforced. I've seen a GPO block RPC dynamic ports by default on a DMZ profile, so verify the profile is correct (Domain vs. Private vs. Public).

If you use a third-party firewall like McAfee or Symantec, disable it temporarily to test. If the error goes away, you know the firewall is the issue. Then configure it properly.

3. DCOM Interface Registration Is Stale or Missing

This one's sneaky. The RPC interface is registered by a COM object. If that object isn't registered correctly, the server doesn't advertise the interface, and you get this error.

Common culprit: an application was uninstalled but left orphaned DCOM entries, or a DLL registration was lost. To check, open dcomcnfg and expand Component Services → Computers → My Computer → DCOM Config. Look for the app you're trying to connect to. If it's missing, you need to re-register it.

Most apps give you a way to re-register—usually regsvr32 on a DLL or an EXE with a /regserver flag. For example:

regsvr32 /u myapp.dll
regsvr32 myapp.dll

Then restart the DCOM-related services. On Windows Server 2019, I've also had to run net stop/start RpcSs after re-registering to refresh the endpoint map.

If the app is custom, you might need to check the registry under HKLM\SOFTWARE\Classes\AppID and ensure the AppID value points to a valid GUID. Sometimes the GUID's LocalServer32 key gets wiped during a patch.

Quick Reference Table

That's it. Run through these in order and you'll fix 95% of the 0x00000719 cases I've seen. Start with the services, check the firewall, then dig into DCOM. If none of that works, you're looking at a corrupted OS or a deeper app bug—but honestly, I can count on one hand the times I've gotten past step 2.