How to fix Error 1914 on Windows 11

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Why This Error Happens

Error 1914 (RPCSINVALIDASYNCHANDLE) occurs when an application attempts to reference an asynchronous RPC handle that has already been completed, released, or was never properly initialized in memory. This typically stems from a corrupted RPC runtime library (rpcrt4.dll), a misconfigured DCOM security setting, or a service terminating mid-call before the handle could be properly closed. In most Windows 11 environments, this surfaces when the underlying Remote Procedure Call (RPC) service or DCOM Server Process Launcher is unstable or being blocked by security software.

Step-by-Step Resolution Guide

Step 1: Verify and Restart Core RPC Services

  • Press Win + R, type services.msc, and hit Enter.
  • Locate Remote Procedure Call (RPC) — ensure the Status is “Running” and Startup Type is “Automatic.” (Note: This service usually cannot be manually stopped, but confirm dependencies are active).
  • Locate DCOM Server Process Launcher and RPC Endpoint Mapper — right-click each and select Restart.
  • If the option is greyed out, restart the machine to force a refresh of these dependencies.

Step 2: Reset DCOM Permissions via Component Services

  • Open the Run dialog and type dcomcnfg, then press Enter.
  • Navigate to Component Services > Computers > My Computer.
  • Right-click My Computer, select Properties, and go to the COM Security tab.
  • Under “Access Permissions” and “Launch and Activation Permissions,” click Edit Default and ensure SYSTEM, NETWORK SERVICE, and Administrators have Local and Remote access checked.

Step 3: Run System File and DISM Scans

  • Open Windows Terminal (Admin) by right-clicking the Start menu.
  • Run the System File Checker to fix corrupted RPC libraries:
sfc /scannow
  • If corruption is found and not fully repaired, run the Deployment Image Servicing and Management tool to restore Windows system health:
DISM /Online /Cleanup-Image /RestoreHealth
  • Restart the PC once both scans complete.

Step 4: Check Firewall and Antivirus Interference

  • Go to Windows Security > Firewall & network protection.
  • Ensure that RPC dynamic port ranges (typically 49152–65535) are not being blocked by a third-party firewall or overly strict Group Policy.
  • Temporarily disable third-party antivirus software to test if it is intercepting the async RPC handle before re-enabling it with an exception for the affected application.

Alternative or Verification Steps

  • Verify the Fix: Open Event Viewer (eventvwr.msc) and check the Windows Logs > System folder. If the fix was successful, Error 1914 should no longer appear when you replicate the action that originally triggered the crash (e.g., launching the specific app or service).
  • Alternative Solution: If the error persists after the steps above, perform a Clean Boot (via msconfig) to identify if a third-party background service is hijacking the RPC handle before it can complete its cycle.