[SOLVED] Lost access to VM, ~20 minutes after (re)boot

[dmgeurts]

Hi all,

Deployed OPNsense v24.7.10_2 today on Proxmox 8.3.1 on a new server.

Right from the start I noticed that I would lose access to the GUI after a little time (about 20 minutes). Connectivity to Proxmox itself is rock solid and from Proxmox I can ping the firewall VM, both on the LAN and WAN addresses.

I've now switched to OVS instead of the Linux bridge as I saw issues with neighbor solicitation. And then noticed that both ipv4 and ipv6 connectivity is lost after a little time. Turning the firewall back on, on the nic (disabled system-wide for now), restored network connectivity. What the heck is going on here?

Management of Proxmox will ultimately be behind a dedicated firewall, so I'm not too fussed about the Proxmox firewall, but why do I need to enable the firewall on the nic of a VM to restore service?!

Thanks,

 

[dmgeurts]

This turned out to be user error. Hetzner doesn't like virtual MAC addresses. So they block the traffic after a short amount of time. The fix is this: https://community.hetzner.com/tutorials/install-and-configure-proxmox_ve