I had this “Connection Lost” in workflow editor for more than a week. tried everything found on the forums. Nothing worked. Then I reinstalled the n8n ( on GCP using Docker ), still error wasn’t fixed. So finally I decided give all my configurations and errors to chatGPT and ask to help. Finally it helped me to fix it. The issue was in the WebSockets.
nginx config : before fix
server {
server_name automation.webloomlabs.net;
location / {
proxy_pass http://localhost:5678;
proxy_http_version 1.1;
chunked_transfer_encoding off;
proxy_buffering off;
proxy_cache off;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "upgrade";
}
listen 443 ssl; # managed by Certbot
ssl_certificate /etc/letsencrypt/live/automation.webloomlabs.net/fullchain.pem; # managed by Certbot
ssl_certificate_key /etc/letsencrypt/live/automation.webloomlabs.net/privkey.pem; # managed by Certbot
include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot
}
server {
if ($host = automation.webloomlabs.net) {
return 301 https://$host$request_uri;
} # managed by Certbot
listen 80;
server_name automation.webloomlabs.net;
return 404; # managed by Certbot
}
nginx config : after fix
server {
server_name automation.webloomlabs.net;
location / {
proxy_pass http://localhost:5678;
proxy_http_version 1.1;
chunked_transfer_encoding off;
proxy_buffering off;
proxy_cache off;
# WebSocket support
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "upgrade";
# Required headers
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
}
listen 443 ssl; # managed by Certbot
ssl_certificate /etc/letsencrypt/live/automation.webloomlabs.net/fullchain.pem;
ssl_certificate_key /etc/letsencrypt/live/automation.webloomlabs.net/privkey.pem;
include /etc/letsencrypt/options-ssl-nginx.conf;
ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem;
}
server {
if ($host = automation.webloomlabs.net) {
return 301 https://$host$request_uri;
}
listen 80;
server_name automation.webloomlabs.net;
return 404;
}