Can't connect to my minecraft server thru zerotier

So i have a minecraft server, running on my linux machine, my friend updated his computer to win7, the .net version is too small to install 1.6.2, so he has 1.6.0. Other friends can play on my server with ping ~6ms.
So we even tried disabling firewall, but it didn’t help. I can see his ping, it’s very small, but he can’t connect to my server (Connection timed out: No information). Pls help

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