Authorization result invalid

Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g. https://crt.sh/?q=example.com), so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.

My domain is: mc.horizonhealth.com

I ran this command: N: Create certificate (default settings)

It produced this output:
Target generated using plugin IIS: mc.horizonhealth.com
Authorize identifier: mc.horizonhealth.com
Authorizing mc.horizonhealth.com using http-01 validation (SelfHosting)
{
“type”: “urn:ietf:params:acme:error:connection”,
“detail”: “Fetching https://mc.horizonhealth.com/.well-known/acme-challenge/BtmIMUGikfR44WHoxmqV5C9AI2IEoGq6-qKpHF9hWKo: Connection reset by peer”,
“status”: 400
}
Authorization result: invalid

My web server is (include version): IIS v 10.0.14393.0

The operating system my web server runs on is (include version): Windows Server 2016

My hosting provider, if applicable, is: n/a

I can login to a root shell on my machine (yes or no, or I don’t know): yes

I’m using a control panel to manage my site (no, or provide the name and version of the control panel): no

The version of my client is (e.g. output of certbot --version or certbot-auto --version if you’re using Certbot):