PBS LXC has no network connection after proxmox host reboot

[epicurean]

I have PBS installed as a container in a proxmox 7 host, with CIFS share from a truenas server as its storage. It was working fine until a reboot (after recent proxmox updates) and now it has no network connection. The other VMs on the same host are fine.
"hostname 'PBS' does not resolves to any non-loopback address" - this is the error on front page. The PBS used to take an IP address via DHCP, which my pfsense router puts aside as a static address.

PBS Container:
/etc/network/interfaces:
auto lo
iface lo inet loopback

auto eth0
iface eth0 inet dhcp

ip a:
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0@if30: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether 62:8c:4b:fc:9d:5e brd ff:ff:ff:ff:ff:ff link-netnsid 0
inet6 fe80::608c:4bff:fefc:9d5e/64 scope link
valid_lft forever preferred_lft forever

pct config CTID (on proxmox host)
arch: amd64
cores: 4
description: 192.168.1.165%0A
features: mount=nfs;cifs,nesting=1
hostname: PBS
memory: 35768
mp0: /mnt/PBS,mp=/mnt/PBS
net0: name=eth0,bridge=vmbr0,hwaddr=62:8C:4B:FC:9D:5E,ip=dhcp,type=veth
onboot: 1
ostype: debian
rootfs: HP600-VMS:311/vm-311-disk-1.raw,size=40G
swap: 4096


I do not know where to start to troubleshoot. Thanks for your help

 

[fabian]

check the boot log of the container - it doesn't seem to get an address via DHCP..