Comment # 2 on bug 924591 from Volker Kuhlmann

Same problem exists in oS 13.2 final.

/etc/sysconfig/apache2 contains:

## Type:    string
## Default:    "actions alias auth_basic authz_host authn_file authz_groupfile
authz_default authz_user autoindex cgi dir env expires include log_config mime
negotiation setenvif ssl suexec userdir php5"
...
APACHE_MODULES="...

There is no module authz_default! (I guess it should be authz_core.)

It appears that in some circumstances the string default can end up in
APACHE_MODULES, with authz_core being missing, and the server won't start.

The module description in yast for both authn_core and authz_core is "unknown".