Windows Firewall exception


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Internet Protocol Security (IPsec) is a protocol suite for securing Internet Protocol (IP) communications by authenticating and encrypting each IP packet of a communication session.
On linux platforms, it is literally the name of the firewall itself.

What is exception in firewall
First, the firewall has defaults and they become the baseline. The common defaults are:
  • allow nothing inbound
  • allow all outbound
User defined rules become the "exceptions" usually to allow more control, as in DENY all outbound and then ALLOW specific programs to access the web, eg your browser, email and any host servers. This stops many forms of virus' from "calling home"
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