Maximum packet length reached?

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http://serverfault.com – Clients are having issues connecting to perforce revision server I have set up for them to use. It appears that they have too many checked out/added files that need to be put into the system and they are getting packet reseet issues. Specifically the TCP connection is resetting when its trying to communicate with the server. I made sure the MTU on the eth0 was set to 1492, but I am at a loss on what else could be done to help resolve this problem. I have csf firewall installed on the server and was searching for any kind of settings that could be tweaked for TCP packet limit but could find (HowTos)