This is not directly selfhosting but related. I have 2 Proxmox hosts which both support Intel AMT which is a remote control tool similar to supermicro IPMI, supporting KVM, power cycles and more. I wanted it to be able to repair stuff in case I can't reach the servers via ui/ssh.

I set it up and it worked fine for months. I could access both on ip.address:16992.

Lately, one of them started disappearing after days or weeks. Rebooting brings it back, but it's a running server and I don't want to reboot it so often. The server is working fine otherwise.

Does anyone know that problem? It's hard to pin down since it can't be seen on the host linux (port not shown in netstat for example).

Do any of your logs indicate any problems? Are you behind a firewall like pFsense or Opnsense?

They don't log, at least not to my knowledge, they aren't part of the OS.

They are behind an opnsense, but the broken one is not reachable from inside the network as well and the other one is reachable from outside perfectly fine

Apologies. I misread apparently. I thought your Proxmox boxes were disappearing.

They're right here in the shelf :-)