Minecraft server not working (due to port sharing)?

Hi. I created and started a Minecraft server. I get it myself but my friends don't. I checked and found that it was the port release. I also activated it on my router. But it still doesn't work. It is probably due to the firewall (or the port release of the firewall). I have Kaspersky Internet Security as a firewall, but I can't activate port sharing anywhere. I would appreciate quick answers, thanks in advance.

So you can switch off the Kaspersky Firewall or what I would do first in the Windows settings under Firewall Java free here a tutorial:

your problem is almost explained at the end of the video.

Had to do that for an Ark server too.