If you have discovered a Virus or Trojan on your system you are advised to reset (or check) the settings of your firewall to make sure that no backdoor has been created that allows the hacker to log into your computer easily again even if the Virus or Trojan has been removed.
I’m not a huge fan of software firewalls as you can tell from my previous posts on the subject. Still, if you rely on it and use it you might find this information useful. There are basically two methods of reseting the Windows Firewall.
My favorite one is by using the command line and the command netsh firewall reset which is all you need. The firewall will be reset which makes sure that any malicious changes to it are gone. All of your rules and changes are gone as well but that is the price you have to pay.
The second possibility would be to open the control panel, click on the Windows Firewall icon, there on the Advanced tab and finally on the Restore Defaults button.
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Don’t forget to mention winsockxpfix. Sometimes when removing the torjan, virus, etc it messes with your tcpip stack and it needs to be reinstalled or reset