No internet connection after moving to dmz

I have just installed a new ubuntu 20.04 server with the nextcloud. Most of things went smooth.
I then moved the server to dmz.
Now nexcloud is running fine, but I cannot ping anything from the server (for example
I think that is the reason the push notifications do not work, as errors appear in the logs.
I can ping the router and the default dmz gateway.
I can ping the server from the gateway.
All the policies on firewall seem to be ok.
dhcp4: false
addresses: []
addresses: [,]

route returns:
Destination Gateway Genmask Flags Metric Ref Use Iface
default UG 0 0 0 eno2 U 0 0 0 eno2

I do not know what else you need.
Tried everything.
Thank you in advance for any support.
Ps.: What is interesting, in resolv.conf I found this nameserver
This one does not come from us, but I can ping it. :slight_smile: