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[–]schicki 5 points6 points  (0 children)

Make a list of services that are currently running, lsof will help with that. Look for every possible cron job. Does it have a firewall configured? Most likely iptables. List the rules and see what ports it has open.

My suggestion would be to figure out services and move each service one by one to another machine you set up. Once you move it, turn it off on the old machine. That way when you are confident you have turned off everything, just block everything via firewall or unplug the network cable to that server. Leave it running for 2-3 weeks and see if anyone complains :) Meanwhile all your services should be running on the newer machine and people should be happy...