Some time after removal of antivirus or some other security software you get error or windows firewall settings greyed out and you can get warning like :
“For your security, some settings are managed by your system administrator”
this can be because key in the registry define the firewall policy, just edit the value :
1 - Win + R, 2 - type regedit 3- Go to: [HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\WindowsFirewall\DomainProfile]
change the values or delete al together “DomainProfile”, Restart “windows firewall” service or reboot the computer