Connection lost after upgrade to 1.88.0

TL;DR

Fix: Reporter-confirmed fix (antman1p): add an explicit nginx location block for /rest/push with proxyhttpversion 1.1, Upgrade/Connection headers and Origin/X-Forwarded headers, e.g. location /rest/push { proxypass http://n8n:5678; proxysetheader Upgrade $httpupgrade; proxysetheader Connection 'upgrade'; proxysetheader Origin ...; }. Member Joffcom closed the issue after the nginx-config guidance resolved it.

The error

Issue n8n-io/n8n#14653 (closed, 80 comments): ### Bug Description After the upgrade I started to get error index-D76xStxp.js:293035 [WebSocketClient] Connection lost, code=1008 onConnectionLost @ index-D76xStxp.js:29303 ### To Reproduce 1. Use nginx with reverse proxy 2. Upgrade to 1.88.0 3. WS failing to connect ### Expected behavior WS works as intended ### Operating System Ubuntu 22.04.5 LTS ### n8n Version 1.88.0 ### Node.js Version 21.7.3 ### Database PostgreSQL ### Execution mode main (default)

Fix

1. Reporter-confirmed fix (antman1p): add an explicit nginx location block for /rest/push with proxyhttpversion 1.1, Upgrade/Connection headers and Origin/X-Forwarded headers, e.g. location /rest/push { proxypass http://n8n:5678; proxysetheader Upgrade $httpupgrade; proxysetheader Connection 'upgrade'; proxysetheader Origin ...; }.
2. Member Joffcom closed the issue after the nginx-config guidance resolved it.

Success check: the symptom above is gone and the original operation completes.

When to use

• You hit this exact symptom in n8n.
• You want the verified fix without digging through the thread.

When not to use

• A different error in n8n, even a similar-looking one.
• General n8n setup or credential questions.

Compatibility

• N8n (n8n-io/n8n) Reported against version 1.88.0.

Variant phrasings

• How to fix "connection lost after upgrade to 1.88.0" in n8n
• n8n: connection lost after upgrade to 1.88.0

Edge cases

• After upgrading to 1.88.0, the editor websocket (/rest/push) failed with code 1008 behind nginx reverse proxies.

Source

• https://github.com/n8n-io/n8n/issues/14653

In gh:n8n-io/n8n#14653 (https://github.com/n8n-io/n8n/issues/14653), someone reported: Issue n8n-io/n8n#14653 (closed, 80 comments): ### Bug Description After the upgrade I started to get error index-D76xStxp.js:293035 [WebSocketClient] Connection lost, code=1008 onConnectionLost @ index-D76xStxp.js:29303 ### To Reproduce 1. Use nginx with reverse proxy 2. Upgrade to 1.88.0 3. WS failing to connect ### Expected behavior WS works as intended ### Operating System Ubuntu 22.04.5 LTS ### n8n Version 1.88.0 ### Node.js Version 21.7.3 ### Database PostgreSQL ### Execution mode main (default) The verified resolution from the thread: After upgrading to 1.88.0, the editor websocket (/rest/push) failed with code 1008 behind nginx reverse proxies. Reporter-confirmed fix (antman1p): add an explicit nginx location block for /rest/push with proxyhttpversion 1.1, Upgrade/Connection headers and Origin/X-Forwarded headers, e.g. location /rest/push { proxypass http://n8n:5678; proxysetheader Upgrade $httpupgrade; proxysetheader Connection 'upgrade'; proxysetheader Origin ...; }. Member Joffcom closed the issue after the nginx-config guidance resolved it.