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Im running WinXP, and every once and awhile "Application Layer Gateway Service" will try to connect to the internet. My firewall then stops this. What I want to know is what this is, and why it is ...

A proxy server that inspects packets at the application layer. However, proxy servers must be manually configured, whereas application-level gateways (ALGs) typically perform their functions ...

Four basic types of firewall protection exist--network level, circuit level, application-level and stateful multilayer. Each type has advantages and disadvantages, ranging from ease of implementation ...