now i copied the file /etc/sysconfig/network/config from Leap15.2-Laptop to Leap15.2-PC Remove the script to insert lines to /etc/resolv.conf and after running yast-> system -> Netzwerkeinstellungen (insert static DNS-Addresses) the /etc/resolv.conf contains now all server-addresses. After reboot it works fine. I am very sure, that before this problem occurred, all process started by yast-network has been terminated (no kill, no shutdown, no logout ... ) May bee it was a hazard. Please remember in case of other bug-messages. For me, you can close this bug. Thank you. G���nter