When I change from automatic to manual ethernet from 100baseTX to 1000baseT I lose internet connection

My iMac (21.5-inch, Late 2013) connection is automatically set at 100BaseTX.  I changed to manual (from automatic)  and selected 1000baseT setting in hardware settings.  Lost internet connection when I did so. Is it possible to do this?

You can't magically change a slower connection into a faster one. That has to been done at the switch or the router.

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