Web GUI not available after 6.4 upgrade

[proxdang]

I have been using Proxmox without any issue for the last year. All upgrades are been going well. Today my main proxmox server upgraded to 6.4.

After the reboot the following is the Web GUI:
Loaded: loaded (/lib/systemd/system/pveproxy.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Thu 2021-04-29 20:06:13 CDT; 1min 13s ago
Process: 3814 ExecStartPre=/usr/bin/pvecm updatecerts --silent (code=exited, status=0/SUCCESS)
Process: 3843 ExecStart=/usr/bin/pveproxy start (code=exited, status=255/EXCEPTION)

Apr 29 20:06:13 proxmox systemd[1]: pveproxy.service: Service RestartSec=100ms expired, scheduling re
Apr 29 20:06:13 proxmox systemd[1]: pveproxy.service: Scheduled restart job, restart counter is at 15
Apr 29 20:06:13 proxmox systemd[1]: Stopped PVE API Proxy Server.
Apr 29 20:06:13 proxmox systemd[1]: pveproxy.service: Start request repeated too quickly.
Apr 29 20:06:13 proxmox systemd[1]: pveproxy.service: Failed with result 'exit-code'.
Apr 29 20:06:13 proxmox systemd[1]: Failed to start PVE API Proxy Server.

I have attached a file with a list of all the packages installed.

I saw a tip within this forum to reinstall the main PVE packages:

apt install --reinstall $(apt list --installed | grep pve | sed 's/\/.*$//g')

I have rebooted the host after the above command.

While I had ipv6 disable at the boot level, I have removed that setting prior to reinstall of the pve packages.

All VMs and LXCs guests are running without any issues. The Web GUI is the only part not functioning.

Thank you in advance.

 

[proxdang]

After remove the ipv6.disable=1 from the boot kernel, the web GUI is available after the reboot.

 

[Petr Konderla]

Same here, for some reason web GUI ( at least v6.4 ) must have ipv6 enabled - other parts of Proxmox works fine.

Just for the sake of search in this forum adding the error:

#pveproxy start --debug
pveproxy start failed - unable to create socket - Address family not supported by protocol