ShieldsUP is an online port scanning service created by Steve Gibson of Gibson Research Corporation. The purpose of the utility is to alert the users of any ports that have been opened through their firewalls or through their NAT routers, which can be used by malicious users to take advantage of security vulnerabilities. The utility scans the most common file sharing ports, as well as all service ports (1-1056), and user defined ports, in sets of 64.
It is often recommended for checking port vulnerabilities.
The best way to determine if your computer’s (or router’s) firewall is working and optimized is to effectively try to penetrate it. Browser-based utility ShieldsUP! tests your firewall for vulnerabilities and kinks in your computer’s defense.
After you give ShieldsUP! permission to run tests on your computer and choose a test type, it looks for weaknesses and openings that hackers and intruders can use to attack your machine.
Try ShieldsUP!
This is a free service offered by: Steve Gibson of Gibson Research Corporation
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