Fix RPC_NT_BINDING_HAS_NO_AUTH (0XC002002F) Error

When You See This Error

You'll get the RPC_NT_BINDING_HAS_NO_AUTH (0XC002002F) error when a program tries to make a remote procedure call but the RPC binding doesn't include any authentication information. I've seen this most often in two scenarios:

• After installing a Windows security update on a server running DCOM applications (like older Line of Business apps that talk to each other).
• When using PowerShell remoting (Enter-PSSession or Invoke-Command) across domains or workgroups where Kerberos isn't set up right.

For example, a client called me after their accounting software stopped connecting to the database server after Patch Tuesday. The event logs showed error 0XC002002F every few minutes.

What's Actually Happening

The RPC runtime expects each call to carry some kind of authentication token – a ticket, a certificate, or Windows credentials. When the binding lacks that token, the call fails with this error. The root cause is almost always one of these:

• DCOM security settings are too strict or misconfigured after a security update.
• PowerShell remoting isn't using CredSSP or explicit credentials for cross-domain calls.
• The service or app making the RPC call wasn't coded to pass authentication info (happens with old software).

The Fix: Step by Step

Step 1: Check DCOM Security Settings

1. Open dcomcnfg – press Windows key, type “dcomcnfg”, hit Enter.
2. In the Component Services window, expand Component Services -> Computers -> right-click My Computer -> choose Properties.
3. Go to the Default Properties tab.
4. Set Default Authentication Level to Connect (not None).
5. Set Default Impersonation Level to Impersonate.
6. Click Apply, then OK.
7. After clicking Apply you should see no error messages – the window closes normally.

Step 2: Fix PowerShell Remoting Authentication

If you're using PowerShell remoting across domains or workgroups, the default Kerberos won't work because it can't pass credentials to the second hop. The fix is to use CredSSP or pass explicit credentials.

1. On the client machine, open PowerShell as Administrator.
2. Enable CredSSP on the client by running:

   Enable-WSManCredSSP -Role Client -DelegateComputer *

3. On the server, enable CredSSP as a server:

   Enable-WSManCredSSP -Role Server

4. Now when you connect, use the -Authentication CredSSP parameter:

   Enter-PSSession -ComputerName Server01 -Credential (Get-Credential) -Authentication CredSSP

5. After entering the command, you should be prompted for credentials, then you'll get a PowerShell prompt on the remote server.

Important: CredSSP has security risks – it passes your credentials to the remote server. Only use it in a trusted network. For production, consider setting up Kerberos delegation properly.

Step 3: Update or Patch the Application

If the error comes from an old custom app or a third-party service, check with the vendor for an update. I've seen this happen with apps compiled against older RPC libraries. In one case, updating a Java RMI service to use SecureRPC fixed it completely.

Step 4: Check Windows Firewall and Network Authentication

1. Open Windows Defender Firewall with Advanced Security.
2. Look for inbound rules that block RPC – especially rules with Remote Port set to RPC Endpoint Mapper (TCP 135) or dynamic RPC ports (TCP 49152-65535).
3. Make sure these ports are open for the specific program or service. On a domain controller, you also need to allow RPC over HTTP if using that.
4. After adjusting rules, click Apply – you should see the rule turn green (enabled).

Still Getting the Error?

If none of that works, here's what to check next:

• Windows Event Logs – Look under Applications and Services Logs -> Microsoft -> Windows -> RPC for more details. The event ID is usually 5719 or 1925.
• Network Captures – Use Wireshark to filter for RPC traffic. Look for bind requests that have an empty auth_verifier_co field.
• Service Account Permissions – Make sure the account running the service has Impersonate a client after authentication user right (check Group Policy or Local Security Policy under User Rights Assignment).
• Roll Back Recent Updates – If the error started after a Windows update, uninstall that update temporarily to confirm. Then reinstall after fixing the DCOM settings.

One last thing – sometimes the fix is restarting the RPC services. Run this in PowerShell as Admin:

Restart-Service RpcSs, RpcEptMapper -Force