After a software update and reboot together with some system tweaking, my personal webserver was not loading httpd successfully. I checked /var/log/httpd/error_log and found this: "[alert] mod_unique_id: unable to gethostbyname" followed by my hostname - actually, the hostname I had specified when setting up my server.
I was having some trouble with a large Open Directory installation recently - users were able to authenticate, but never saw their desktop - they got a "you are unable to log in at this time..." error instead, then were logged back out.
I've learned almost everything I know about UNIX on my own, and even when I've been shown how to do something from the command line, troubleshooting often puts me on the path of self-instructed discovery.
MacTroll has been very good about posting helpful tutorials for the installation of various unix-type tools and plugins for OSX Server. However, many of you might find (as I have) that attempted unix installs sometimes just don't work (usually with a returned error like "no c-compiler found" or the like).
