Ok so first of all I never had this issue before.. I've always been able to fix any issues I usually encounter but this one I just can't find anything that works.
Here's what happens: I create a vanilla world on 1.14.1 (version should be irrelevant because we tested with earlier Minecraft versions like 1.13 and 1.12 and the issue was the same) and open to LAN.
My friend then add a server on multiplayer on his end and copy-paste my Ipv4 with the LAN numbers my game provides me. He successfully joins and a few seconds after he is loaded in, he get kicked out.
On his screen he gets the error message: ''internal exception java.io.ioexception an existing connection was forcibly closed by the remote host''
When my friend hosts the game the same way though I am able to join his world and play without being kicked out. We tested with a 3rd friend and same result, i don't get kicked out on their world but they get kicked out in mine. Note that it is not a server!!! Just a single player vanilla open LAN world. Never had that issue before and I can't figure what could've changed on my computer or network to cause the issue.
Things I have tried:
-Shut down firewall
-Shut down firewall AND antivirus
-Re-install latest Java version
-Update all windows update and drivers and restart computer
-Reboot my modem
-Changing my network from public to private and vice versa
I have also looked at the https://bugs.mojang.com/browse/MC-38565 thread but nothing on there is helpful.. it seems like i cannot find anywhere on the internet someone that had this specific issue the way i'm experiencing it with a single player vanilla open LAN world..
I've always been the one hosting and storing the worlds and would like to keep it that way as I often like to work on them solo and my friends never had any issues joining before, why does my computer kick them out automatically?
Get rid of Hamachi and port forward properly, Hamachi has been squatting on an IANA-allocated IP block (126.96.36.199/8). As such, Hamachi fundamentally conflicts with the internet itself.
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We've never had any issues with it though and Hamachi is not the issue here since the players are able to enter my world, if Hamachi was the problem they couldn't connect whatsoever in the first place. And me connecting to them works perfectly. We've been using this method of playing for years without issues.