How to fix Error 733 on Windows 11

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Why This Error Happens

Error 733 (ERROR_PPP_NO_PROTOCOLS_CONFIGURED) occurs when Windows 11 attempts to establish a PPP-based connection—typically a VPN or dial-up connection—but no valid network protocol (such as TCP/IP) has been properly bound to the connection. This is usually caused by corrupted or missing network protocol bindings on the RAS (Remote Access Service) adapter, outdated or conflicting VPN drivers, or a misconfigured registry entry for the PPP settings. It can also surface after a Windows update resets network adapter configurations.

Step-by-Step Resolution Guide

  1. Verify TCP/IP is enabled on the connection:
  • Go to Settings > Network & Internet > VPN, select your VPN connection, click Advanced options, then go back to Control Panel > Network and Internet > Network Connections.
  • Right-click the VPN adapter, select Properties, go to the Networking tab, and ensure Internet Protocol Version 4 (TCP/IPv4) is checked.
  1. Reset the network stack using an elevated Command Prompt (Run as Administrator):
   netsh int ip reset
   netsh winsock reset

Restart the PC after running these commands.

  1. Reinstall the WAN Miniport devices:
  • Open Device Manager > expand Network adapters.
  • Locate all WAN Miniport (PPTP), (L2TP), and (IP) entries, right-click each, and select Uninstall device.
  • Restart your PC—Windows will automatically reinstall these miniport drivers.
  1. Check the registry for missing PPP protocol entries:
  • Open regedit and navigate to:
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\RasMan\PPP
  • Ensure this key and its subkeys exist and are not corrupted. If missing, restoring from a system restore point is safer than manual recreation.
  1. Update or reinstall your VPN client software (if using third-party VPN software), as outdated PPP protocol handlers are a common cause of Error 733.

Alternative or Verification Steps

  • After applying the fix, attempt to reconnect to the VPN/dial-up connection—if it connects without the 733 error and retains internet access, the issue is resolved.
  • If the error persists, create a new VPN connection profile from scratch via Settings > Network & Internet > VPN > Add VPN, as corrupted connection profiles are a common alternative cause.