How to fix Error 1733 on Windows 11

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Troubleshooting Guide: Error 1733 – “The Tag Is Invalid”

Why This Error Happens

Error 1733 typically occurs when the RPC (Remote Procedure Call) interface encounters a malformed or unrecognized data structure, often due to corrupted RPC endpoint mappings or mismatched interface versions between client and server components. This can also stem from corrupted system files related to the RPC service, damaged Windows registry entries, or network communication issues where data packets get fragmented or altered in transit. In some cases, outdated or conflicting drivers—particularly network or virtualization drivers—can interfere with the RPC binding process, triggering this invalid tag response.

Step-by-Step Resolution Guide

Step 1: Restart the RPC Service and Dependencies

  • Open the Run dialog (Windows + R) and type services.msc, then press Enter.
  • Locate “Remote Procedure Call (RPC)” in the list, right-click it, and select Restart.
  • Also restart the “DCOM Server Process Launcher” and “RPC Endpoint Mapper” services, as these are dependencies.

Step 2: Run System File Checker and DISM

  • Open Command Prompt as Administrator (search “cmd”, right-click, Run as Administrator).
  • Execute sfc /scannow and allow the scan to complete fully.
  • Follow up with DISM /Online /Cleanup-Image /RestoreHealth to repair the underlying Windows image.
  • Restart your computer once both commands finish successfully.

Step 3: Check and Update Network/Virtualization Drivers

  • Open Device Manager (Windows + X, then select Device Manager).
  • Expand “Network adapters” and any virtualization-related entries (e.g., Hyper-V Virtual Switch).
  • Right-click each device, select “Update driver,” and choose “Search automatically for drivers.”
  • Reboot the system after updates are applied.

Step 4: Reset Winsock and TCP/IP Stack

  • Open Command Prompt as Administrator.
  • Run netsh winsock reset and press Enter.
  • Run netsh int ip reset to reset the TCP/IP stack.
  • Restart the computer to apply these network-level changes.

Alternative or Verification Steps

  • After completing the steps above, reproduce the original action that triggered Error 1733 (e.g., data retrieval, RPC call, or service connection) to confirm the tag error no longer appears.
  • If the issue persists, check Event Viewer (eventvwr.msc) under Windows Logs > System for related RPC or DCOM error codes, and consider creating a new user profile to rule out profile-specific corruption.