Nice program man, at first it won't autostart with windows, so ofc i uninstalled it, but guess what?
That didn't remove the changes it did. Only those programs allowed before uninstalling were able to connect to the internet.
I gone crazy uninstalling everything else while the suspect that your program was the cause was growing in my mind and at the end i reinstalled it and YES. Your program was the cause.
Which kind of windows shitty technology are you using behind this abort?
So where are those changes left? Have i to read Windows source code which noone knows becouse this is a dead operating system to understand how to remove the changes your program does?
Nice JOKE MAN.
You could try and see if resetting the Windows Firewall will restore your connections. https://www.ghacks.net/2007/12/19/reset-the-windows-firewall/
Edit: Before doing the above try and reinstall simplewall, run the app, click uninstall filters from within the app. then uninstall the app.
I'd assumed you had the same issue as me were the app won't even show the window.
Good luck.
You can't read and i am joker?

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You can't read and i am joker?