Cannot get Certificate

I’ve got a VPS and I’m trying to get Certificate for my Exchange 2010. Running 2012 R2 Standard. The Error I’m getting is “config checks failed to verify https:// is both publicly accessible and can serve extensionless files” The website can be accessed with no problems. I’ve looked everywhere to see what the problem is. Can someone help me. The domain I’m trying to encrypt is cl-exch01.learntotechsolutions.com

I tried to follow this method and it’s not working:

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