[Wlug] system time config question

I'm having trouble keeping the time correct on one of my linux boxes. Just one of them. My others are just fine. In all cases, I'm using the redhat-config-date gui. When I use the gui, it corrects the time just fine, but somethings not happening to check the reference network time (daily?) to correct the local system time. I've compared a number of things between systems to try to identify what's wrong on the one machine, but I haven't found the key yet. Any suggestions? TIA, Bill