How can I fix the Telegram Trigger test mode hanging and 'Provided secret is not valid' error in n8n?

Below are some troubleshooting steps and suggestions to help resolve your issue with the Telegram Trigger node hanging and the error:

Test Mode Hangs in the Telegram Trigger Node

This behavior is known to occur when the node is waiting for an event. In test mode, if no message is received, the workflow appears to hang. To resolve this:

• Reset the Node: Exit the workflow and reopen it to reset the node's listening state.
• Verify Event Activity: Ensure that you are sending actual Telegram messages (or triggering the corresponding event) to the webhook URL that n8n is listening on.

“Provided secret is not valid” Error

This error indicates that there is a mismatch or an issue with the webhook secret. Some points to double-check:

• WEBHOOK_URL Configuration:
  When running n8n behind a reverse proxy (like Nginx), you must set the WEBHOOK_URL environment variable with the public URL where your instance is hosted. For Telegram, this URL must use HTTPS. Confirm that you have updated the WEBHOOK_URL correctly after switching from ngrok to your own domain.

• Reverse Proxy WebSocket Support:
  The Telegram Trigger node also relies on proper websocket proxying. Ensure that your Nginx (or other reverse proxy) configuration forwards websocket connections. For example, in Nginx you could use:

  NGINXCopied
  location / {
      proxy_pass http://localhost:5678;
      proxy_http_version 1.1;
      proxy_set_header Upgrade $http_upgrade;
      proxy_set_header Connection "upgrade";
      proxy_set_header Host $host;
  }

• TLS/SSL Termination:
  Since Telegram requires an HTTPS URL for webhooks, make sure your domain provides a valid TLS/SSL certificate. If the certificate is self-signed or not properly configured, Telegram may reject the webhook registration.

Summary

1. Test Mode Hanging:

   • Exit and re-open the workflow to reset the node.
   • Confirm that events (e.g., messages) are being generated.

2. Secret Error (“Provided secret is not valid”):

   • Confirm that your WEBHOOK_URL is correctly set with the public HTTPS URL.
   • Verify that your reverse proxy (Nginx) is correctly configured for both HTTP and WebSocket forwarding.
   • Ensure proper SSL termination.

Following these steps should help you resolve the issues with the Telegram Trigger node in your current setup. If problems persist, reviewing your reverse proxy settings and related environment variables may uncover further clues.