Proxmox latest version firts install problem

[detxm80]

Hi,
i've installed proxmox latest version on nuc (with version 7 no problem). When reboot it host is unreachable and no gui access.
Can you help me to resolve this issue?
on my fritzbox i see it connected but if i ping it host is unreachable.
thanks

 

[leesteken]

As always: what is the output of ip a and cat /etc/network/iinterfaces? A readable photo of the Proxmox host console will be good enough.

 

[detxm80]

hi, i find the problem. the system go down if i don't connect any monitor, any ideas? i've 8 version. with 7 version no problem