Issue with connection lost on when using apache proxy

[dg92]

Describe the problem/error/question

Hey all! I keep getting “Connection Lost” when running n8n via a apache revese proxy.

My config is as follows:

<VirtualHost *:443>
ServerName n8n.domain.com
ServerAlias n8n.domain.com
DocumentRoot /var/www/n8n.domain.com 

RewriteEngine On
RewriteCond %(HTTP:Upgrade) websocket [NC]
RewriteRule /(.*)    ws://localhost:5678/$1 [P,L]

ProxyPreserveHost On

ProxyPass / http://127.0.0.1:5678/
ProxyPassReverse / http://127.0.0.1:5678/

SSLCertificateFile /etc/letsencrypt/live/s1.domain.com/fullchain.pem
SSLCertificateKeyFile /etc/letsencrypt/live/s1.domain.com/privkey.pem
Include /etc/letsencrypt/options-ssl-apache.conf

ErrorLog n8n.domain.com.in-error_log
CustomLog n8n.domain.com.in-access_log common

Chrome console shows the following: index-683d9781.js:220 WebSocket connection to ‘wss://n8n.domain.com/rest/push?sessionId=v86rbfg9rqn’ failed:

Do you have any idea why this will not work?

What is the error message (if any)?

Chrome console shows the following: index-683d9781.js:220 WebSocket connection to ‘wss://n8n.domain.com/rest/push?sessionId=v86rbfg9rqn’ failed:

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## Information on your n8n setup
- **n8n version:** Latest
- **Database (default: SQLite):** Default
- **n8n EXECUTIONS_PROCESS setting (default: own, main):**
- **Running n8n via (Docker, npm, n8n cloud, desktop app):** Docker
- **Operating system:** Ubuntu

[EmeraldHerald]

Hi @dg92 Sorry to hear you’re running into this!

It sounds like your reverse proxy isn’t correctly configured - if you’re on latest you should already have N8N_PUSH_BACKEND to websocket, but could you post the rest of your Docker compose file for us to take a look? Obviously don’t post any sensitive credentials

The problem may be the Apache config, but someone like @Jon would unfortunately be more familiar with this. That being said, you may also want to check out this post:

I updated n8n to 1.5 im getting connection lost

Alright so for anyone that needs it I have just spent a bit of time learning about Apache2 as a reverse proxy. To get n8n up and running with Websockets in 1.0 below is an example config file that works when used with n8n in a container. This example is for HTTP so if you were using HTTPS you would need to make those changes. <VirtualHost *:80> ServerName n8n.yourdomain.tld RewriteEngine On RewriteCond %{HTTP:Upgrade} =websocket [NC] RewriteRule /(.*) …

[Jon]

It looks like this is the likely cause, @dg92 let me know how you get on with the change to your Apache config.

[dg92]

Hey All,

thanks for the info! I will give it a try. Thank you.

[Adriano]

Enable Apache module proxy and proxy_wstunnel

sudo a2enmod proxy

sudo a2enmod proxy_wstunnel

edit apache2 conf with the content bellow
sudo vi /etc/apache2/sites-available/000-default.conf

<VirtualHost *:80>
        ServerName n8n.yourdomain.com
        RewriteEngine on

        ProxyPreserveHost On

        ProxyPass / http://127.0.0.1:5678/
        ProxyPassReverse / http://127.0.0.1:5678/

        RewriteCond %{HTTP:Upgrade} websocket [NC]
        RewriteCond %{HTTP:Connection} upgrade [NC]
        RewriteRule ^/?(.*) "ws://127.0.0.1:5678/$1" [P,L]

</VirtualHost>

Restart apache2
sudo systemctl restart apache2