Migration to Proxmox / Empty frontend

[vibr77]

Hello all,
I am struggling for days on my z2m,
I migrated from HomeAssistant docker to Proxmox LXC,
After restoring the data file and modifying the configuration file (adding adapter & baud rate) I was able to start my z2m network with 90 devices,
The frontend is also accessible but remain empty without devices, but I can see devices activities in the log...

When looking at the browser javascript console I have :
WebSocket connection to 'ws://zigbee2mqtt.xxxx.net/api' failed: There was a bad response from the server.

What is wrong with my installation ?
thanks for your support,
Vincent

[vibr77]

This is what I have in my frontend error

[vibr77]

The problem exist with Safari and not with google...