AWindows Server 2008 Network Port Reference
Active Directory Ports
The first part of Appendix A lists TCP/IP ports used by Active Directory services in Windows Server 2003 and 2008.
88/tcp and 88/udp-Kerberos
Kerberos is an industry standard distributed authentication system that is implemented in Windows Server as its default authentication mechanism. Kerberos is implemented as a KDC (Key Distribution Center) service that runs on domain controllers. KDC listens on port 88 for ticket requests.
123/udp and 123/tcp-NTP
NTP stands for Network Time Protocol. Domain controllers need to synchronize time and ensure that no one Kerberos client on the network has a time deviation of more than five minutes (configurable). Timestamps are used by a mechanism ...
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