[CentOS] systemd and httpd

Hello,

On my new CentOS 7 server httpd stops running after about two minutes or 
so.  strace shows me the process is asking for a password, and failing 
to get one, times out.  In reading the docs I see an option to systemd: 
--no-ask-password.  Can anyone tell me where and how to set this?

As a workaround, I added "KillMode=none" to httpd.service, but I'd 
rather use the option to just not ask for a password.

Thanks,
Jack