After installing SSL certificate, website now prompts me with a sign-in box

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My domain is:
I ran this command:
Install new ssl certificate using "Certify the Web" UI client and verified domain using http-01 method.
It produced this output:
It installed the certificate and created new bindings for port 443
My web server is (include version):
Dedicated Windows Server from ionos
The operating system my web server runs on is (include version):
Windows Server 2019, IIS 10
My hosting provider, if applicable, is:
I can login to a root shell on my machine (yes or no, or I don't know):
yes, also remote desktop login
I'm using a control panel to manage my site (no, or provide the name and version of the control panel):
The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot): "Certify the web"

So all looks good from installing the certificate and verifing the domain but when I visit the url, I am being prmpted to a sign in box, and I don't how what credentials it ask. I have also create simple html website with same results.

I agree your cert looks good.

And, I see the below response to your domain which is causing the sign-in. But, that's coming from something in your server configuration. You said IONOS provides the server system so you should ask them. Or, try posting on the Certify the Web community forum. There are more Windows server experts there that might have seen this before.

The problem is the below response which is not coming directly from IIS but something enforcing NTLM on your system. I only know from google what NTLM is :slight_smile:

curl -I

HTTP/2 401
server: Microsoft-HTTPAPI/2.0
www-authenticate: Negotiate
www-authenticate: NTLM
date: Fri, 16 Jun 2023 11:45:30 GMT

That may well be coming from IIS.
The site needs to allow anonymous access.
In IIS Manager, locate the web site and open "Authentication":
Then ensure "Anonymous Authentication" is enabled:


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