Nevermind, I found the problem. SuSEfirewall2 was still enabled, which was preventing firewalld from starting. Disabling SuSEfirewall2 solved the problem.
Hello,
I had the same problem on that laptop, where I upgraded from o.S. 14.3 to o.S 15.0 by zypper. where SUSE firewall2 was still on. After uninstall the problem was solved.
A did a fresh install of o.S. 15 with DVD on my other two laptops and everything worked o. k- from the beginning.
Ebkr