Every time I've seen the issue, it affects the GUI *ONLY*. My next attempt would be to install the iSM, however, I don't know if you'll be able to install it in Proxmox or not. Are you running Proxmox bare metal, or in a VM?
Hello, I bought a T320 recently, and the firmwares were very outdates (iDRAC, RAID, Network...) so I updated all firmwares and when I arrived into the iDRAC (2.63.60), I realized that the "Storage" menu displayed a "RAC0503" issue. So after searching on the internet, I was able to find solutions (link1) , but I haven't been able to correct that. After many tests (downgrading, resetting...), I was able to see a correct "Storage" menu with downgrading iDRAC to 2.30.30. If I upgrade to 2.40.40, the issue appends again. Here are the following firmwares: [IMAGE] Do I have to downgrade the PERC firmware ? Anyway, I'd like to upgrade to the more recent iDRAC firmware (2.63.60.62) without any "RAC0503" errors, even if everythings works fine (I can see and create RAID without problems with Ctrl-R menu), so it seems like a iDRAC issue. Thank you !    
[SOLVED] Dell T320 + H710 + IDRAC > 2.30.30: RAC0503