Port Scanning – Firewall Best Practices

Port Scanning

Use GRC’s ShieldsUP Port Scanning tool to find out if any ports have been opened through your firewall or NAT Router.  If it is indeed opened, make sure that it is for a legitimate purpose and is secured.  If you do not know why a port is open, you are better-of by closing it – this could be performed at the NAT Router / Firewall level.

Other Resources:

http://lifehacker.com/5511734/shieldsup-tests-your-firewall-for-vulnerabilities

Port Scanning – Firewall Best Practices

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