Online Port Scanners to test vulnerability
The best way to determine if your computer’s (or router’s) firewall is working and optimized is to effectively check whether ports are vulnerable or not.PC Flank & ShieldsUP are common web services for these online port scanning ability.
About PC Flank’s tests
You can easily test your system for vulnerability to Internet threats with PC Flank’s online tests. Each test should take no more than 3 minutes, depending on the speed of your Internet connection. Visit http://www.pcflank.com/
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. You can test in five different categories: file sharing, common ports, all service ports, messenger spam, and browser headers. When a test completes, ShieldsUP! will displays the results and offer suggestions for how you can improve your security, with detailed explanations. It’s a good tool for evaluating your computer’s security and determining whether you need to secure more up your computer’s defenses.