connection refused to webui but ssh working

I reinstalled last volumio vestion (2.389) on a raspi, configured successfully the wifi access to my home network, scanned my NAS music but after the next reboot, I get a “connection refused” from the webui, from both volumio.local and 192.168.0.22, both adresses allowing ssh access though. How can I troubleshoot the webserver ?

The problem is the same whether I connect to the raspi through ethernet or wifi.