About ISA Server Services

Internet Security and Acceleration Server 2004/2006 SDK

ISA Server acts as a gateway to the Internet, implementing security in three security layers: the IP packet layer, the application layer, and the circuit layer. This multilayered approach is made possible by the services included with ISA Server:

  • The Microsoft® ISA Server Control service (isactrl). This service is responsible for restarting the other services as necessary, generating alerts, running actions, and other functions.
  • The Microsoft Firewall service (fwsrv). This service is implemented at the circuit-layer level.
  • The Microsoft ISA Server Storage (ISASTG). This service provides local storage for the ISA Server configuration.
  • The Microsoft ISA Server Job Scheduler service (isasched). This service downloads content from the Internet according to a user-defined schedule.
  • The MSSQL$MSFW service (MSSQL$MSFW). This service is the instance of the Microsoft SQL Server Desktop Engine (MSDE), called the Microsoft Data Engine, that is installed with ISA Server and is used for logging.

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