Can't connect to NextCloud console

[potemkin_ai]

@nebulon I do:

terminal-c5ikyfn6.js:6307 WebSocket connection to 'wss://my.server.com/api/v1/apps/e075a2fe-7f7f-40ff-ae12-056766d2780d/exec/d7f60f4a9d5d72e7ced6aaf3d0f035fbe98c397f37690fe99ddcba72b0539d97/startws?tty=true&rows=25&columns=183&access_token=a8uNp2OOgZpy_00xcyYa3gKGGAb8SQGO0B6-Tydok3k' failed: 
connect @ terminal-c5ikyfn6.js:6307
terminal-c5ikyfn6.js:6322 Socket error. Reconnecting... Event {isTrusted: true, type: 'error', target: WebSocket, currentTarget: WebSocket, eventPhase: 2, …}
terminal-c5ikyfn6.js:6317 Socket closed. Reconnecting...

[potemkin_ai]

and that is happening not only for NextCloud actually, I just didn't notice!

[nebulon]

ok, so just to rule out some more cases. Can you use cloudron exec for any of those apps, just to see if this may be something between your browser and the Cloudron or a backend issue.

Also while trying to access the webterminal or cloudron exec, follow the cloudron logs at /home/yellowtent/platformdata/logs/box.log

[potemkin_ai]

@nebulon will do, thanks.

Could you please, tell me - what cloudron exec does? Never used it - only using WebUI and ssh command lines on the server, in those rare cases, when got to check something.

[james]

Hello @potemkin_ai

cloudron exec is the cloudron cli version of the web terminal but in your local shell.
Example:

cloudron exec --app nextcloud --tty

Then you should have the nextcloud terminal in your local terminal.

[potemkin_ai]

Hello, @james . Thanks!

For anyone wondering of the same - the best way is the following commands - from any other computer, then the server.

npx cloudron login my.precious.com
npx cloudron list
npx cloudron exec --app $id--tty

(no need to install anything globally)

Nothing at the box.log, I'm getting the following error from the cli:

npx cloudron exec --app e085a31f-7f7f-40ff-ae95-056766d2781d --tty
Could not upgrade connection to tcp. http status: 502

And here is the nginx log entries:

IP - - [21/Jan/2026:14:18:03 +0000] "GET /api/v1/apps/e085a31f-7f7f-40ff-ae95-056766d2781d HTTP/2.0" 200 7965 "-" "-"
IP - - [21/Jan/2026:14:18:03 +0000] "POST /api/v1/apps/e085a31f-7f7f-40ff-ae95-056766d2781d/exec HTTP/2.0" 200 78 "-" "-"

The Cloudron is behind a proxy, but I can't see any WebSocket related restrictions.

[james]

Hello @potemkin_ai

@potemkin_ai said in Can't connect to NextCloud console:

The Cloudron is behind a proxy

This is a mayor detail which you should have mentioned earlier since it is outside the default Cloudron spectrum.
Is it the whole Cloudron or just Nextcloud?
Please explain in detail what you mean with Cloudron is behind a proxy.

[potemkin_ai]

you should have mentioned earlier

@james I wish I was aware that it is the problem!

The whole cloudron is behind a haproxy that does TCP level proxy. From my understanding it should not affect, as it's one level below the HTTP(S) and WebSocket is above HTTPS.

And the console doesn't seem to work for all apps terminals.

Any ideas how to narrow down the root cause?

[james]

Hello @potemkin_ai
Sorry, but running Cloudron behind a proxy is an advanced setup outside the normal scope.
If you have a Cloudron subscription, feel free to reach out to our support mail support@cloudron.io.
Still, since this is outside the normal scope I can not guarantee any support there.

[potemkin_ai]

I do have a subscription. Just yesterday I've figured out the problem is with HTTP 2 protocol that is failing on the hand-over; disabling it on the proxy and leaving with HTTP 1.1 works just fine, as the protocol do the fallback from H2 to WebSocket over HTTP 1.1, which works just fine.