Replacing Apache instance with Tomcat 6

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http://serverfault.com – I'm on a Linux machine and am trying to replace an Apache2 instance with a Tomcat 6 instance. I shut down the Apache instance by running a kill on the appropriate pid, but when I try to access any pages, I get an error 504 instead of 404. Additionally, when I run the Tomcat 6 instance, I still get the error 504. Requests to port 80 get returned much faster than requests to port 8080. Any idea what I can do to get Tomcat 6 up and running? (HowTos)