Server-side anticheat not working

Help and Feedback Scripting Support
#1

I’m trying to make a server-sided anticheat that checks if the player’s speed goes above the maximum speed allowed. This doesn’t work for some reason, anyone able to help?

local maximumSpeed = 16
local checkInterval = 1

local function checkSpeed(character, player)
	if character.Humanoid.WalkSpeed > maximumSpeed then
		player:Kick("Speed hacks detected.")
	end
end

game.Players.PlayerAdded:Connect(function(plr)
	plr.CharacterAdded:Connect(function(char)
		while wait(checkInterval) do
			checkSpeed(char, plr)
		end
	end)
end)
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#2

Properties changed by local scripts aren’t replicated to the server, so even if the exploiter has a walkspeed of 100 on their client, the server still sees it as 16 walkspeed. What you could do is check the current position and a stored position from the last check and see if the magnitude of the difference is too big

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#3

The anticheat is not really futureproofed. Imagine you somehow alter the player speed for gameplay purposes and they all get kicked for exploiting.

#4

Just like @heII_ish said. It doesn’t replicate to the server causing the server script not being able to detect it. Even though its only changed on the client you still move faster because movement of the character is handled by the client
https://gyazo.com/072e5dbb65e7746c5bb19a0c4e0f466e

#5

Use HumanoidRootPart.Velocity.Magnitude instead. It measures how many studs the player is moving at, which are the same as the walkspeed. However, it also changes when the player is being moved in any way (fling, bodyvelocity, etc…), so you will have to make sure not to false-ban someone for something unrelated to WalkSpeed.

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