Are you sure?
a select all with a tty except session leaders
x select processes without controlling tty
will list all processes
ps -ef |more
If it truly isn't running, how was it started. Did you nohup it from
the console or does it start up on boot?. Otherwise, when you exit, it might have exited (don't know anything about webservers, but
happens with other programs that remain tied to the console). You can also look for a core file in the directory it was running in.