Cloudflare Tunnel Error | Error 1033

Because “Cloudflare Tunnel Error” can refer to several different issues, the fix depends on the specific Error Code you are seeing in your browser or logs.

Here is the quick fix guide for the three most common tunnel errors.

1. Error 1033: Tunnel Error

• What it means: Cloudflare knows the tunnel exists, but the cloudflared software on your server is not running or is disconnected.

• The Fix:

  1. Check the Service: Go to your server terminal and check if the tunnel is running.

     • Linux: sudo systemctl status cloudflared

     • Windows: Check “Services” for “Cloudflare Tunnel agent”.

  2. Restart it: If it’s stopped, run sudo systemctl restart cloudflared.

  3. Check Logs: If it keeps crashing, check logs with journalctl -u cloudflared -f (Linux) to see why (usually an authentication or update error).

2. Error 502: Bad Gateway

• What it means: The tunnel is working, but it cannot reach your local app. (e.g., The tunnel is trying to talk to localhost:8080, but your app is down or refusing connections).

• The Fix:

  1. Wrong Port/IP: Double-check your Tunnel configuration in the Cloudflare Dashboard (Access > Tunnels > Configure > Public Hostname). Does the service URL match exactly where your app is running (e.g., http://localhost:3000)?

  2. HTTPS Mismatch: If your local app uses self-signed HTTPS, you must enable “No TLS Verify” in the tunnel settings under “Additional Application Settings > TLS”.

  3. Docker Users: If running cloudflared in a container, it cannot see localhost. You must use the container name (e.g., http://my-web-app:80) or the host IP.

Also Read : Tuff Client Eaglercraft

3. “Connection Refused” (In Logs)

• What it means: The tunnel is trying to forward traffic, but your firewall or app is blocking it.

• The Fix:

  • Ensure your application is listening on 0.0.0.0 (all interfaces) rather than just 127.0.0.1 if you are using Docker or a VM.