It's simple, he just can't join. Before anyone suggests, yes, i've tried opening ports (25565, i'm playing with mods and using the 1.12.2 server.jar), disabling firewall, reopening the server, restarting Hamachi, disabling antivirus, etc. The server is fine, at first. Btw, this is not the first time. Hamachi, with me and my friends, never works. I really want to find a solution to this, as i really want to play. I expect answers as early as possible (btw, sorry for my English, it's not my first language).
Get rid of Hamachi and port forward properly, Hamachi has been squatting on an IANA-allocated IP block (188.8.131.52/8). As such, Hamachi fundamentally conflicts with the internet itself.
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