Also, if you go to http://rest.s3for.me/ (the URL you use to calculate uptime) the error message in the document tree says 'The AWS Access Key Id you provided does not exist in our records'.
You mentioned S3 stands for Storage Should be Simple, what does AWS stand for in your company? Unfortunately cloud software isn't my forte, I would love to know what that acronym stands for.
My naivete leads me to believe that your status check is hosted with Amazon, and that your uptime checker would in fact be checking Amazon's uptime but I am surely mistaken.