[SOLVED] pveproxy only listening on ipv6 address, not on ipv4

I had same situation. Fresh install ov proxmox ve on debian 11.
The solution was to delete last line in /etc/hosts file, where was ipv6 address and hostname (duplicated).
And after reboot, I was able to login from web interface.
 
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I found this problem after changing the hostname of the machine but had a typo in /etc/hosts so it was different from the entry in /etc/hostname.