To stop the Internet Security and Acceleration (ISA) Server service. open a CMD prompt and type:

net stop mspfltex

You will receive a message that informs you that the command can stop the other services that you installed during the ISA installation. Responding Y will stop the services. To restart them, you can restart the computer.

You can individually Stop / Start these services, using the long or short names:

                              "ISA Server Packet Filter Extension Driver"    Mspfltex                              "Microsoft Web Proxy"                          W3proxy                              "Microsoft Firewall"                           Fwsrv                              "Microsoft ISA Server Control"                 Isactrl