I'm getting a self-assigned certificate expiration notification and unfortunately.
what are the top 5 reasons people create a self-assigned certificate for an application?
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To put in simple terms Self Signed Certificates are like false drivers licence .It provides security to a certain level but can be easily hacked but its still better than having nothing .Check this excellent article
Now why the certificates expired message exists is a mystery and there is a good blog with some research but its still a mystery but no harmful effects observed due to false positive.