To be able to use webhooks for trigger nodes of external services like GitHub, n8n has to be reachable from the web. To make that easy, n8n has a special tunnel service, which redirects requests from our servers to your local n8n instance (uses this code: [https://github.com/localtunnel/localtunnel](https://github.com/localtunnel/localtunnel)).
In case you run into issues, check out the [troubleshooting](troubleshooting.md) page or ask for help in the community [forum](https://community.n8n.io/).