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I started up a private minecraft server for my friend and I, and that required me to use generic TCP forwarding in order to open it up to accept his IP address. I used this program called serveo.io for the tcp forwarding that opened up my network to accept incoming connections. the command i use is this

ssh -R (portnumber):localhost:(localhost number) serveo.net

however, i'm also getting connections from random ip addresses i don't know such as this one

37.214.18.102

furthermore, i'm pretty sure i can catch viruses from having the ports i use open, even though I have OSX firewall and avast antivirus enabled. is there any way to whitelist my friend's ip address and block all the other ones? i'm relatively new to servers/port forwarding so it would be very helpful if someone could help explain that, as well as any other measures I should take to prevent receiving viruses/trojans/other malware over the internet.

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