1. First, you must decide which protocols you need access to on the external network. Below is a table of the most popular ones:
2. Open the ISA Server Management console, navigate to [Server] expand Servers and Arrays, then expand [SERVER] and go to IP Packet Filters. Here you'll create the IP Packet Filters to allow access to the Internet from ISA Server Machine itself. I will go over an example for SMTP. On the General tab you can enter a meaningful name for the filter and an optional description.
With this example and the table above you can create the filters necessary to allow the access to SMTP, POP3(S), IMAP, HTTP(S), SMTP(S), NNTP(S) and among others.
To to the Policy Elements and then the Protocol Definitions node. You will find the definitions of the protocols. Always remember to invert of Inbound for Outbound.
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Author: Alexandre Cavalcante Alencar
Alexandre Cavalcante Alencar is a technical support and coordinator of Aspec, develop, support, consulting, account firm located in Fortaleza, CE Brazil specializing in account software. Current project is to develop a practical how to manual for the ISA Server and Windows 2000 OS Server/Professional.