My Proxmox server doesn't appear in my router.

[Gor]

Hi All,
I am very new to this. I installed Proxmox, it worked well for a couple of months. When I decided to reboot, it restarted normally, but router does not see it anymore, and I cannot use the web interface. Physically, the cable is connected properly.
Please help.

 

[Lukas Wagner]

It seems like the identifier for the network interface has changed. In /etc/network/interfaces, vmbr0 uses enp4s0, while you only have enp1s0.
Try changing both occurrences to enp1s0 and then execute ifreload -a or reboot.

Have you changed anything with your hardware? Have you maybe installed a BIOS upgrade?
The interface identifiers are derived from physical properties, like the PCI bus address. If that changes, the interface identifier changes as well.

 

[Gor]

Yes I updated BIOS. I see now it was the reason why interface identifier has changed.
I did exactly as you said and it worked. I typed nano /etc/network/interfaces to open network configuration file, changed all enp4s0 to enp1s0 and it worked! Thank you so much!