N8n on Plesk on Cent OS

[smitterer]

Hi everyone,

Describe the problem/error/question

n8n frontend shows the warning “Connection Lost / You have a connection issue or the server is down. n8n should reconnect automatically once the issue is resolved.”
Therefore I can’t save changes to a workflow.

What is the error message (if any)?

You have a connection issue or the server is down. n8n should reconnect automatically once the issue is resolved.

Please share your workflow

Set-up n8n via portainer with the following env:

In Plesk, I set up a proxy rule:

I tried to set different things in nginx as seen on multiple posts like:
server {
server_name n8n.XXX.XX;

location / {
    proxy_pass http://localhost:5678;
    proxy_set_header Connection '';
    proxy_http_version 1.1;
    chunked_transfer_encoding off;
    proxy_buffering off;
    proxy_cache off;
}

}

Nothing worked yet.

Information on your n8n setup

• **n8n version: 1.6.1
• **Database (default: SQLite): SQLite
• **Running n8n via (Docker, npm, n8n cloud, desktop app): Docker
• **Operating system: Cent OS

Any idea how I can fix this?

Thanks

[MutedJam]

Hi @smitterer, welcome to the community!

I reckon this is a problem with your nginx configuration which would need extra lines for websockets support (which is how your n8n talks to your browser). Check out this post from @Valerian_Lebert for an example configuration

[smitterer]

Thank you very much!

For anyone else who is experiencing this problem:
The two env variables which were necessary are WEBHOOK_TUNNEL_URL and WEBHOOK_URL