System, Security, Application, Directory Service, DNS Server, File Replication, Print Server, ISA Server, Exchange Server, SQL Server, and IIS server event analysis Security is becoming an increasingly important part of everyday life, especially in computer system environments. Companies use firewalls and virus scanners to protect their network perimeter and systems from external threats. Unfortunately, not everybody who works at a company can be trusted. This is not necessarily because of malice. Industry studies show that more thank 70% of security issues originate internally.