Erm... Administrator in Linux basically means nothing. It's just another username and there's nothing special to it.
However if you see someone logging into your server with "root" then you'll need to start jumping. LOL. This should not be a problem however you would still need to check if there's a user called "Administrator" on the system and if there is what is its privileges and etc.
Better be safe than sorry.
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We get this all the time. They're just bots that try various username combinations like Administrator, Staff, Manager, etc. until they get banned by the firewall. Nothing to worry about, but you can still check the logs to make sure.
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