Cobalt released “RaQ 3” Linux OS in 1999, tailored for their network appliances. Initially popular with ISPs and small businesses, this port was based on Red Hat 6.1. A Retrocomputing YouTuber, “The Phintage Collector,” then adapted it for Virtualbox. Notably, the default login credentials are admin/admin, and root access can be achieved easily. The OS is extremely outdated and insecure, so it’s not recommended for untrusted networks. The kernel used is 2.4.15, updated for Proxmox compatibility. Besides some potential issues due to missing LCD panel support, the disk has been expanded and updated for better reliability and user storage.
https://archive.org/details/CobaltOS-Proxmox