Programs from 'nut' package are configured and compiled to use
'nogroup' group id. There is no such group and 'service nut start'
fails due to this.
It's compiled with --with-uid=`id -u nobody` --with-gid=`id -g nobody`
i think, you have wrong id for nobody.
# rpm -qf /usr/bin/bestups
# strings /usr/bin/bestups | grep nog
and a daemon complaints on a startup about missing 'nogroup' gid.
It is quite possible that a configuration and/or compilation of the
whole thing is buggy but this what this report was about.
it's fixed in nut-0.44.3-1.