Websocket and CSRF Issues

Infos:

• Used Zammad version: 6.3.1-1721886578.f7062be2.noble
• Used Zammad installation type: package
• Operating system: Ubuntu 24.04
• Browser + version: Thorium (Chromium) 122.0.6261.132

Expected behavior:

• Websockets connect and CSRF verification passes.

Actual behavior:

• On loading a page, two error appear in the browser console.

WebSocket connection to ‘wss://example.domain.net/ws’ failed: application-b820e7570fbedd664bf2d3065c01e42b6a02bb13b21dce74504f0fe02289f54e.js:109

WebSocket connection to ‘wss://example.domain.net:6042/’ failed: application-b820e7570fbedd664bf2d3065c01e42b6a02bb13b21dce74504f0fe02289f54e.js:109

I checked the console and

I, [2024-07-26T04:15:14.443800#788-541180] INFO – : CSRF token verification failed
I, [2024-07-26T04:15:14.443932#788-541180] INFO – : CSRF token verification failed! (Exceptions::NotAuthorized)

appears every 10 minutes or so which I think might be related.

Steps to reproduce the behavior:

• Install Zammad from apt
• Disable included webservers
• Install Caddy webserver
• Use this Caddy configuration:

I have changed {scheme} to https to no avail.

Thanks for any help!