httpd is not restarting cleanly with mod_dnssd enabled

Issue

• Whenever I try to restart httpd, it does not start up again. The problem appears to be that 1 httpd process always remains when it is attempting to do a stop the httpd service. How can I get this resolved so that it can be stopped and started cleanly. To resolve this, I need to kill the remaining httpd process and then start httpd service again.