Windows 2000 Service Pack 2 (SP2) solves many security problems, including several important Internet Information Servers (IIS) 5.0 vulnerabilities, but you need to perform some basic steps to secure IIS.
One great feature in Windows 2000 Server is Terminal Services. Installing Terminal Services, however, requires thought and attention to security, or you could open a large security hole in your network.
Check out this Windows-based intrusion detection and audit trail security software. LT Auditor +, 7.0, provides 24x7 monitoring of network activity across the enterprise, protecting organizational assets accessible through NT and Novel networks.