Proxmox upgrade from 8 to VE 9.2

[Jelrik]

Hello everyone,

A couple of weeks ago, I upgraded my Proxmox node from version 8 to version 9.2. Everything seemed to work fine initially, but after a few days, I suddenly lost all access to the Proxmox Web UI and network. Doing a hard reboot temporarily brought it back, but the issue returned after another couple of days.

Suspecting a failing network card, I purchased a new one and tested it, but the exact same issue persisted. Thinking it might be hardware-specific degradation, I decided to migrate everything to a completely new server with a fresh Proxmox 9.2 installation.

However, after a few days of uptime, the exact same issue happened again on the brand-new setup.

Has anyone experienced something similar on version 9.2, or does anyone have an idea what could be causing this?

 

[kawano-y]

Hi,

You may want to take a look at this related thread:

W

Thread 'Web gui not working after 8 to 9 upgrade'

Jun 7, 2026

Hi,

I did an in place upgrade from version 8 to 9 and now I can't seem to access the web gui.
The autostart VMs start up and I can get ssh access to proxmox.
I tried troubleshooting from prior posts but having no luck so far. Can anyone please point me in the right direction?

• wirez
• Replies: 7
• Forum: Proxmox VE: Installation and configuration

It may not be the exact same issue, but it includes useful troubleshooting steps for Web UI connectivity problems after upgrading from 8 to 9, such as checking the status of `pveproxy` and whether anything is listening on port 8006.

Since your issue comes back after a few days and also happens on a completely new server, I would also look into network-side causes, such as duplicate IP addresses, DHCP range overlap, firewall rules, or ARP/MAC conflicts.