x11vnc on startup

Following this tread → https://forums.opensuse.org/showthread.php/476492-x11vnc-startup-script?highlight=x11vnc

I try to enable the service with Service Manager in Yast I get this error:

Writing the configuration failed:
Could not enable x11vnc. *vnc.service - LSB:Start or stop vnc server
Loaded:loaded (etc/init.d/vnc, generated;vender preset:disabled

The link you’re referring to is for openSUSE 12.1, which is ancient. You’d be better of with these instructions: https://doc.opensuse.org/documentation/leap/reference/html/book.opensuse.reference/cha.vnc.html

I tried that rout also but I get a black screen … That’s why I wanted to use x11vnc.