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Have you ever gotten this error message when trying to (re)start Apache
If you are running with an SSL certificate on your box, Apache cannot start up without the correct passphrase. I've run into this problem a couple times. Once when I rebuilt my virtual server from Mosso and the reboot process (obviously) required Apache to be started up when the machine came back up. Not being there when the start up phase required the correct passphrase Apache was up but not handling requests. The other time my server crashed when it ran out of memory. It was a 256 meg O'RAM box running a Rails app. Go figure!
httpd not running, trying to start (98)Address already in use: make_sock: could not bind to address 0.0.0.0:80 no listening sockets available, shutting down
Fortunately, there is an easy solution. Kill Apache and start it up again. If you're in the console you'll be prompted for the passphrase. Enter it correctly and everything will be fine. Here's how I did it.
I took at a look at the running processes and grep for apache. The one I wanted was the 2nd to last. Look for the process id and kill it with the -9 option. The process id will be in the second column to the left
ps aux | grep apache root 3948 0.0 0.2 4028 668 ? S 17:48 0:00 /bin/sh -e /etc/rc2.d/S91apache2 start root 3959 0.0 0.2 4028 616 ? S 17:48 0:00 /bin/sh /usr/sbin/apache2ctl start root 3964 0.0 2.4 133564 6472 ? S 17:48 0:00 /usr/sbin/apache2 -k start root 4069 0.0 0.2 6268 660 pts/0 R+ 17:49 0:00 grep apache
After it's dead you can restart Apache like so
kill -9 3964
You'll get the prompt for the passphrase. Enter it and everything should be fine.