Application Layer Gateway Service
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Application Layer Gateway Service (alg.exe) Application Gateway Program that runs on a firewall between two networks.
ALG.EXE is a sub component of the Internet Connection Sharing (ICS) and Internet Connection Firewall (ICF) services in Windows. This allows third party application protocols to work behind the firewall. ALG is installed during normal Operating System installation. It listens to (FTP) File Transfer Protocol requests on TCP Port 21
In Windows it is set to Manual by default. This service should not be disabled.
Windows XP, Server 2003, Vista
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