Debugging an on premise application error: 405 Method not allowed

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Has anyone run into this error message before? We are using a windows server on premise.   Any information would help to get our clients Sys Admin on the right track.   Here is a link to a screen shot http://imgur.com/a/PZZeI    
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is the URL you use exactly like https://www.example.com/debugger/  (watch the trailing /)?

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