Proxmox not reachable by SSH and web GUI

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I have set up my proxmox environment a few days ago and it was working very well... for 2 days: it suddenly became unreachable from SSH or web GUI. I still can connect directly on the host.

I have found similar threads on the Proxmox forum but I couln't make it working so far :( Can someone help me please?

Here are some information in screenshots. Please note:

  • In a thread someone asked for the status of the sshd.device, but I don't know what it is, and if the cause of the problem would be that it is inactive (dead)
  • I had a cyclic error on a custom service: gdrive.service, so a file system failed to create because rclone finds the token should be expired. But systemctl list-units --failed did not report errors. So I tried stopping the service and now it displays an error. Can it be this file system failure that cause the problem? Or it is more probably a consequence of the network error?

EDIT

I just see that my gateway (192.168.1.254) is not reachable from proxmox. So proxmox seems to be "out of internet"

I can see it in /etc/resolv.conf But I don't know why I can't access it from proxmox, while I can from my PC

EDIT 2

Good news, it's working today! But this worries me a little bit: why could it be down so long?

ssh services status

ip a

network interfaces

failing services

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