I don't know how to create a ssl certificate

My domain is: atlas-sap.com

I ran this command: sudo cerbot certonly --standalone

It produced this output:

Please enter in your domain name(s) (comma and/or space separated) (Enter ‘c’
to cancel): atlas-sap.com
Obtaining a new certificate
Performing the following challenges:
http-01 challenge for atlas-sap.com
Waiting for verification…
Challenge failed for domain atlas-sap.com
http-01 challenge for atlas-sap.com
Cleaning up challenges
Some challenges have failed.

IMPORTANT NOTES:

My web server is (include version):

The operating system my web server runs on is (include version): ubuntu 20.04

Hi @ATLAS

please start with some required basics:

If you want to use standalone, you have to stop your running website. So the port 80 of your webserver / ip address can be used.

But there

answers your website, not the --standalone created webserver.

So that can’t work.

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