Hosting my own server, keeps saying "identity of the server has changed"

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Here is an image of what I mean: Attachment 14071 (http://ift.tt/29AR7Id) Basically I'm hosting this server from my own computer. I set it up so that I am the server admin. At first everything works correctly. When the server restarts though, thats... Hosting my own server, keeps saying "identity of the server has changed"