Medium
Operating Systems
✓ Solution Verified by Community (0+ upvotes)
How to fix error rpc-s-unknown-authz-service in Windows 11
RPC_S_UNKNOWN_AUTHZ_SERVICE = 1750
Fix based on community reports and expert analysis. Last verified: 2026-08-12
· How we verify fixes
| Error Code | rpc-s-unknown-authz-service |
|---|---|
| Affected System | Windows 11 (Microsoft) |
| Difficulty | Medium |
| Estimated Time | 15 min |
| Requires Admin Rights | ⚠️ Yes |
| Requires Reboot | 🔄 Yes |
Solution Steps
- 1 Press Windows key + X and select 'Terminal (Admin)'. Run the command 'regsvr32 secauthn.dll' to register the standard security authentication DLL. This ensures the default authorization services are available.
- 2 If the application requires a specific security package, install it. For example, if it requires a custom package, you may need to install the vendor's software.
- 3 Check the registry for the list of authentication packages. Navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa and ensure 'AuthSSO' or other required packages are present.
- 4 Restart the computer to load the new security packages.
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