Thks for your interest!
What surprised me was that /etc/resolv.conf pointed to /run/systemd/resolv.conf which didn't exist..?
The network applet however used my provider's dns. But name resolution failed (probably not available to other clients).
This untilI I corrected /etc/resolv.conf and let it see correct nameservers.
However, NetrworkManager doesn't seem to identify my provider's dns and reverts to 1.1.1.1 (which is not a problem).
I can't fathom what happened and would be pleased to undestand.
Anyway, case is solved..