More Info: How to Fix io.netty.channel.abstractchannel$annotatedconnectexception
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Completely disable the firewall and try again.
I did it, the port is still closed.
Which antivirus are you using?
I have found in my 1.5 years of running minecraft servers that the windows firewall needs to be completely disabled for any servers to work... But that's just me.
1. OP already tried that.
2. You did not make proper exceptions to your firewall then.
If you are still having issues let me know I will help you troubleshoot further.