CertifyTheWeb Domain Validation Failed

I have a windows server 2016 running RDS. The IIS version is 10

I had issue with the config check. At first, I was getting extensionless errror, so I added web.config below.

mimeMap fileExtension="." mimeType=“text/plain” />

Now, I if I go http://cloud.abkcpa.us/.well-known/acme-challenge/configcheck from the server, it’s fine. But if I try to access the configcheck from any other computers, I get 404 error.

HTTP will give 404 error
HTTPS is a success (Extensionless File Config Test - OK)

What am I missing on the IIS settings? Everything is default

This is the error that I got:
Validation of the required challenges did not complete successfully. Domain validation failed: cloud.abkcpa.us
Invalid response from http://cloud.abkcpa.us/.well-known/acme-challenge/k-5Ni3AFK53SVHawC4hVwQG2Ff4S7y5eEkqUHQsp-zk []: "\r\n<html xmlns=“http” Forbidden urn:ietf:params:acme:error:unauthorized


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Hi, I have replied to your query on the Certify The Web community forum: Help: Domain Validation Failed - #2 by webprofusion - Question - Certify The Web - Support Community

The most likely issue is that the wrong server on your network is responding, because you are seeing different results via different ports.

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