I'm interested in this as well. I had problems initially where ProxMox wasn't recognising my drives. The guy I bought the R620 from was running Proxmox so I decided to install it and add an SSD to install the OS. After some investigation, I found out that the SAS cable was plugged into the wrong connector. It still didn't recognise the SSD but it was able to recognise the two 300Gb SAS drives that came with it. After a couple of attempts, Proxmox was finally installed. During installation, it was able to connect to the network as it's able to be assigned an IP address. However, after installation, there's no activity on any of the ethernet ports. I've tried different cables, different ports on the switch and still nothing. Hopefully, somebody can shed some light on this.