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You appear to be on a router where you flipped on a security switch in the router and now this MTU is not working properly. There is a small, small button on the back of your modem or router. You have to press it with the tip of a pen, it's that small! This will reset all settings on the modem or router and then you can power off and on the box for 30 seconds, leave it on and try again. ONLY DO THIS IF YOU OWN CONTROL OVER THE BOXES OR GET PARENTS PERMISSION FOR THIS KIDS! By default, all the security settings are disabled and go back to original working state for configuration or use or the box. If you turn on anything security related on your router or modem, this will give you MTU issues all the time! Stop touching those settings if you don't know how to configure a router.