Failed authorization procedure while trying to get SSL with lets encrypt

Hello team,

Please bear with me as i am new to the LAMP stack. I am trying to set up a new website on Apache WS running on Ubuntu 18.04. However, when i try to access the index file from my browser, i get the error below.

Bad Request Your browser sent a request that this server could not understand. Reason: You’re speaking plain HTTP to an SSL-enabled server port. Instead use the HTTPS scheme to access this URL, please. Apache/2.4.29 (Ubuntu) Server at <mydomain.com> Port 80

I have tried to troubleshoot and obtain an SSL using lets encrypt on Ubuntu 18.04. When i try to obtain the SSL certificate using the command - “sudo certbot --apache”, i get the error below;

**_user@mydomain:/etc/apache2/sites-available$ sudo certbot --apache Saving debug log to /var/log/letsencrypt/letsencrypt.log Plugins selected: Authenticator apache, Installer apache

Which names would you like to activate HTTPS for?

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1: www.mydomain.com

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Select the appropriate numbers separated by commas and/or spaces, or leave input blank to select all options shown (Enter ‘c’ to cancel): 1 Obtaining a new certificate Performing the following challenges: http-01 challenge for www.mydomain.com Waiting for verification… Cleaning up challenges Failed authorization procedure. www.mydomain.com (http-01): urn:ietf:params:acme:error:dns :: DNS problem: NXDOMAIN looking up A for www.mydomain.com - check that a DNS record exists for this domain; DNS problem: NXDOMAIN looking up AAAA for www.mydomain.com - check that a DNS record exists for this domain

IMPORTANT NOTES:

• The following errors were reported by the server:

  Domain: www.mydomain.com Type: None Detail: DNS problem: NXDOMAIN looking up A for www.mydomain.com - check that a DNS record exists for this domain; DNS problem: NXDOMAIN looking up AAAA for www.mydomain.com - check that a DNS record exists for this domain_**

The error.log file shows the error below.

[Tue Mar 22 15:14:10.276671 2022] [core:notice] [pid 92897] AH00094: Command line: ‘/usr/sbin/apache2’ [Tue Mar 22 15:24:07.559081 2022] [mpm_prefork:notice] [pid 92897] AH00171: Graceful restart requested, doing restart [Tue Mar 22 15:24:07.612286 2022] [mpm_prefork:notice] [pid 92897] AH00163: Apache/2.4.29 (Ubuntu) OpenSSL/1.1.1 configured – resuming normal operations [Tue Mar 22 15:24:07.612305 2022] [core:notice] [pid 92897] AH00094: Command line: ‘/usr/sbin/apache2’ [Tue Mar 22 15:24:14.017792 2022] [mpm_prefork:notice] [pid 92897] AH00171: Graceful restart requested, doing restart [Tue Mar 22 15:24:14.075406 2022] [mpm_prefork:notice] [pid 92897] AH00163: Apache/2.4.29 (Ubuntu) OpenSSL/1.1.1 configured – resuming normal operations [Tue Mar 22 15:24:14.075424 2022] [core:notice] [pid 92897] AH00094: Command line: ‘/usr/sbin/apache2’