In Tumbleweed, latest openSSH update disables root login by default.
So, if you have only 'root' user on your headless system, please run the following command on your system, before running a 'zypper dup':
echo -e "\n# Allow root login on ssh\nPermitRootLogin yes" >> /etc/ssh/sshd_config
Otherwise, you will not be able to login to your system anymore.
If it is too late, please use a local connection (serial or keyboard/screen, if not headless), or edit the /etc/ssh/sshd_config file on your SD card from another computer.
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