this happened the third time today after I've been wiping my SSD and reinstalling OMV.
I've been trying to set up OMV with smb, ftp, omv-extras5.14, docker and cockpit
after some time it just stops responding to anything outside of my local network.
meaning, I can't do apt-get update, nor install anything with apt-get. or even ping google.
local network, web interface and ssh is all working.
Last time I had this issue all I was using was stock OMV 5, latest update, and set up smb. no plugins.
doing apt-get update gives me stuff like Temporary failure resolving 'deb.debian.org'
and all /etc/resolv.conf shows is
"# No DNS servers known."
tried to add dns-nameservers 126.96.36.199 188.8.131.52 to /etc/network/interfaces. No luck.
my Ubuntu Installation from my other SSD works just fine.
anyways, I fixed it.
Whoever has the same issue as me, run omv-firstaid and do the network setup.
make sure you select your actual network adapter and not docker.
it looks like docker uses a virtual adapter that somehow got prioritized over my actual network adapter.