have you started it with the Terminal?
sudo apachectl graceful
should give you some more verbose info if it errors.
Well, if it were that easy there would not be a problem. Your comand starts apache whith mac normal config. FM 13 dosent work with that. It uses its own httpd.conf. If you look in the launchdemon there is one line "/Library/FileMaker Server/HTTPServer/bin/httpdctl" which runs "
/usr/sbin/httpd -k start -D FILEMAKER -f "/Library/FileMaker Server/HTTPServer/conf/httpd.conf"".
If someone know how to run the first command as fmserver (I guess is the problem) I think my problem will be solved.
Ah, in the past, the filemaker installer added a line to the default apache config to include that. So you are trying to switch the user "fmserver" in order to run that command? Have you tried
sudo su - fmserver
I don't have FMS 13 installed on OS X just yet, so trying to help.