I have a Centos 5 64-bit server that has ntp service enabled. Windows XP with SP2 cannot properly sync to it for time, but can communicate with it via samba, ssh, and anything else. I also disabled the Windows Firewall. The C5 system does not have any firewall enabled. Other C5 workstations can successfully sync to it via ntpdate. What else could cause the XP machine to not be able to time sync with the C5 server? Thanks. Scott