Why is that when I want to connect to a LAN server in 1.17.1, I get the io.netty.channel.abstractchannel.annotatedconnectexception
If we play in 1.16.5 there is no problem.
Then it cant be firewall issues!
I have reset router
I have updated java (on all machines)
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I have the same issue and CANNOT find a fix, only in 1.17.

Did you ever find a fix? have the same issue and am desperate lol. Have tried everything everyone sais.
Duplicates MC-120362