hostname lookup failed

Sorry for this noob question. I have a small proxmox dc with two hosts. I've deployed a new ubuntu 20.04 server based vm on one of the hosts. From that vm I'm able to ping *any* lxc-container and/or vm with their host and fqdn name - no problem here. These lxc:s and vm:s are also available...

Hi all, new Proxmox user since a few months for a home server. I have some basic experience with vmware & virtualbox but recently got a refurbished mini pc which I geared up with Proxmox and a few containers and vm's; initially this was a test but because I liked it, I continued this path...