To test if your Firewall is active and running efficiently:
- Go to this link
- Click on the Proceed button
Here are the results:
If attempts to connect to your PC have failed, then it simply means that your Firewall is doing is job.
- Common ports: it will check the ports if this result is green it means that your ports are invisible, if they are of a different color please check the configuration of your firewall. (If everything is green it means you are invisible: you do not exist for hackers).
- All services ports: this will scan all your ports from 1 to 1056 and inform you whether your firewall protects well. **As below:
- Color Code:
- Green: the port is invisible
- Blue: the port is closed, but it is not invisible
- Red: the port is OPEN! Please immediately configure your firewall, as any hacker can enter without worries!
Test your port locally (using a software)
- There exist software to run on your computer even to test the ports (like "local port scan").
- The reliability of the software is almost zero, because they will not check which interface ports are open (localhost, external IP, or all interfaces).
- Only a test carried out by external software to your computer (such as grc.com) are to be considered.
Online tests are not 100% reliable
- Online test are not guaranteed to be 100% efficient.
- There are indeed techniques such as Port Knocking and Single Packet Authorization, which can open ports in a firewall without this being visible in these tests.
- (That said, if tests such as grc.com tell you that your ports are closed, you can be confident more than 99%.)
Some softwares can help to test the firewall.
- Here are the latest information I have gathered about the subject:
- Once the firewall software being tested is installed, it is configured with the highest-available protection settings. The computer is connected to a closed network, with the only one other system on the network being the one we use to send the port-attacking commands to the computer.
- Nmap software's port-attacking commands are used to probe all 65,535 ports of a system. A detailed report is generated for each command, which reveals the status of each port as Open, Closed, Filtered, Unfiltered, or Stealth. Stealth is the best possible status and indicates that a firewall is working well.
This document, titled « Testing your firewall online », is available under the Creative Commons
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