A security license is needed to run security services successfully  and  also to support Secure Socket Layer Virtual Private Network (SSL VPN),  which authenticates a user to access a restricted network remotely with  mobile devices such as smart phones or tablets. It does this securely  through the encryption of all network traffic. Below are some of the licensing articles on ISA500 series devices: Renew Security License on ISA500 Series Integrated Security Appliances This is a live document. New contents will be added to this document when available. ... View more

Wide Area Networks (WANs) are networks that cover a large area unlike Local Area Networks (LANs). The ISA500 Series Integrated Security Appliance can have two WAN ports  at the same time. Dual WAN uses two WAN connections at the same time so that, even if one  connection fails, the other connection continues to provide Internet  access to the network. This feature is helpful for load balancing which allows traffic to be distributed over the two WAN connections in  different ways. Below are the articles related to Dual WAN settings, Load balancing and failover: WAN Traffic Metering Settings on ISA500 Series Integrated Security Appliance Dual WAN Settings on ISA500 Series Integrated Security Appliances Dual Wide Area Network (WAN) Wizard on ISA500 Series Integrated Security Appliances WAN Settings on ISA500 Series Integrated Security Appliances Wide Area Network (WAN) Link Failover Detection Settings on ISA500 Series Integrated Security Appliance ... View more

When a specific type of traffic is sent through a specific outbound  port, Port Triggering opens a specific inbound port for responses from  the destination of the outbound traffic.  Port Triggering opens ports  when a network device connects to an  outbound port, but only opens the  inbound port to one device at a time. 600 seconds after the data  exchange is complete, the open ports are closed for security and to make  the ports available for other uses. For this reason, Port Triggering is  more secure and flexible than Port Forwarding. Port Triggering is  useful when a remote server requires that data to be sent from one port but  then the remote server sends responses to another port. Below are the articles related to Port Triggering: Port Triggering on ISA500 Series Integrated Security Appliances This is a live document. New contents will be added to this document when available. ... View more