⚡ Network/VPN Error

Fix Broadband Connection Error 629 VPN Error 631 633 650 - Complete Solution Guide

📅 Updated: Apr 15, 2026 ⏱️ 15-30 min read ✅ Verified Solutions

🌐 Connection Errors

Error Codes: 629, 631, 633, 650

Type: Broadband/VPN connection failures

Message: "The port was disconnected" or "already in use"

Fix Time: 10-20 minutes

VPN, dial-up, or PPPoE broadband connection attempted, instead of connecting, Windows throws error: 629 ("Port was disconnected by remote machine"), 631 ("User disconnected"), 633 ("Port already in use"), or 650 ("Remote access server not responding"). Internet connection present - other devices work fine - but this specific connection keeps failing.

Errors all related to Windows RRAS (Routing and Remote Access Service) and network adapter communication. Mean Windows couldn't establish or maintain connection, but reasons vary: port/modem in use by another process, connection interrupted during handshake, drivers outdated, or remote server not responding properly.

Positive: most errors have common fixes. Will restart network services, recreate connection profile, update drivers, adjust TCP/IP settings. Errors look intimidating but usually solvable within 20 minutes.

Understanding Connection Errors

Error breakdown:

  • Error 629: "Port disconnected by remote machine" - Connection dropped during/after handshake
  • Error 631: "User disconnected port" - Windows thinks YOU disconnected, but didn't
  • Error 633: "Port already in use" - Another program/connection using modem/port
  • Error 650: "Remote server not responding" - Can't reach VPN/PPPoE server

Common causes:

  • Network adapter driver issues - Outdated or corrupted drivers
  • Stuck connection process - Previous connection attempt didn't close properly
  • Firewall/antivirus blocking - Security software interfering
  • Corrupted connection profile - Saved connection settings damaged
  • TCP/IP stack corruption - Network protocol configuration broken

Fix #1: Restart Services and Recreate Connection

Service restart
  1. Command Prompt as Admin:
    • Execute: net stop remoteaccess
    • Wait 10 seconds
    • Execute: net start remoteaccess
  2. Delete and recreate connection:
    • Network Connections → Right-click VPN/broadband connection → Delete
    • Create new connection with same settings
    • Test connection

Fix #2: Reset TCP/IP and Network Adapter

TCP/IP reset
  1. Command Prompt as Admin, execute:
  2. netsh winsock reset
  3. netsh int ip reset
  4. ipconfig /flushdns
  5. Restart computer

Fix #3: Update Network Drivers

Driver update
  1. Device Manager → Network adapters
  2. Right-click adapter → Update driver
  3. Or download latest from manufacturer website
  4. Restart and test

Quick Fixes

  • Disable firewall temporarily: Test if security software blocking
  • Check modem/router: Restart both devices
  • Verify credentials: Ensure username/password correct

FAQ

Why multiple error codes same problem?

All related to connection establishment failure. Different codes indicate different failure points, but fixes overlap significantly.

Will resetting TCP/IP affect other connections?

Temporarily. May need to reconnect WiFi or reconfigure static IP addresses after reset. Doesn't delete saved networks, just resets protocol stack.