I use Comodo Internet Security Premium 12.2.2.8012 on windows 10.
If i block as example thunderbird, thunderbird can still connect and receive or send e-mails. If i block firefox, it cannot connect to comodo.com, but it can connect to google or amazon as example. I can see all the connections in the windows resource monitor, but i cannot see them in the comodo connections window. I use comodo on another pc and there everything works as expected. Same settings and all. I can only guess at this point. One possibility is a recent windows update, since the pc where everything works, has not been updated to the newest version yet. Another guess would be that comodo does not properly see the network. There is only 1 cable / network connected so i don’t know what it could do wrong there.
Edit:
I fixed it by deactivating IPv6 in the network settings in Windows 10.
Then i looked in comodo and saw that there is also the option “Filter IPv6 traffic”, which seems to be deactivated by default. So i checked it and switched IPv6 back on in Windows and low and behold it also fixed the issue. So whenever i blocked an application before with comodo, it could just use ipv6 when possible. Thats so dumb.
Now i have to wonder, why is there a seperate switch for IPv6 (and none for IPv4) and why is it deactivated by default in comodo? It essentially means that the comodo firewall is half deactivated by default … I know that IPv6 was not very wide spread before, but i think it’s time to at least activate it by default and maybe even remove that option entirely. Is there any use to not having it on?
Not sure yet why my other PC did not have the same issue, but it does use a different e-mail provider. Maybe no IPv6 available. Btw. i don’t need/want to block thunderbird, it’s just how i noticed that issue by accident.