How to fix this "unreachable - need to frag (mtu 1365)"

You fix this by putting your MTU on the correct setting. For normal Ethernet, that number is 1500. Also, you may want to note to others you're doing this because you believe your Fortnite game has a problem; because it sends small packets and/or not/using the fragmentation flags.

You will never reach the Fortnite server at Amazon if you keep lowering the MTU of the packets and refuse to fragment them. I think you may need to understand what you're doing and why it's actually causing your problem:

Also see:

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