Proxmox won’t boot after removing NC365T NIC — need help identifying cause

hannamontanna

New Member
Nov 8, 2025
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Original setup:
Optiplex with an NC365T running Proxmox.

Services:
  • .arr stack
  • Nextcloud
  • OPNsense (using NC365T for WAN and LAN)
I recently migrated OPNsense and the NC365T into a Lenovo M720q. I expected some network issues afterward on the Optiplex, but I thought Proxmox would still boot so I could fix configs or back up my VMs.

However, after removing the NIC and booting, the Proxmox CLI login appears for ~5 seconds, then the system hangs or reboots. I can’t ping or reach the web UI. The only way to stop the crash is booting with:

Pressing 'e' at the blue boot screen of proxmox and then add this to the linux line: init=/bin/bash

I’ve commented out all NC365T-related lines in /etc/network/interfaces, but it still loops.

I am extremely new to this type of fault finding, so any help I would highly appreciate.