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You may encounter a scary-looking warning from time to time if you use SSH to log into other systems. The warning itself is real: you should double-check to make sure that you're not connecting to an imposter/man-in-the-middle server. However, oftentimes within FAU, we'll upgrade computers, etc, causing the key for the computer to change, thus giving remote users the error. This article explains the steps to remove the warning for the known-"good" computer and establish a remote connection again