Unable to get SSL certificate with lets encrypt for new subdomain/virtual server

[denisremix]

SYSTEM INFORMATION
OS type and version	Ubuntu 20
Virtualmin version	latest

I have requested previously certificate for other virtual servers/subdomains without any problem but now I am getting:
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator webroot, Installer None
Obtaining a new certificate
Performing the following challenges:
http-01 challenge for mail.send.catalyzerinc.com
http-01 challenge for send.catalyzerinc.com
Using the webroot path /home/send.catalyzerinc.com/public_html for all unmatched domains.
Waiting for verification…
Challenge failed for domain mail.send.catalyzerinc.com
Challenge failed for domain send.catalyzerinc.com
http-01 challenge for mail.send.catalyzerinc.com
http-01 challenge for send.catalyzerinc.com
Cleaning up challenges
Some challenges have failed.
IMPORTANT NOTES:

• The following errors were reported by the server:

  Domain: mail.send.catalyzerinc.com
  Type: connection
  Detail: 213.199.48.111: Fetching
  http://mail.send.catalyzerinc.com/.well-known/acme-challenge/uj3ogk5UwG2cA-4OvR7TnKFo9vW7r5asVjbTdyCC-LE:
  Connection refused

  Domain: send.catalyzerinc.com
  Type: connection
  Detail: 213.199.48.111: Fetching
  http://send.catalyzerinc.com/.well-known/acme-challenge/Hx0fc55ZiZjm4Ys8EPL4HXu6p1QIK_JO4pHuTzXnM9g:
  Connection refused

  To fix these errors, please make sure that your domain name was
  entered correctly and the DNS A/AAAA record(s) for that domain
  contain(s) the right IP address. Additionally, please check that
  your computer has a publicly routable IP address and that no
  firewalls are preventing the server from communicating with the
  client. If you’re using the webroot plugin, you should also verify
  that you are serving files from the webroot path you provided.

Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator manual, Installer None
Obtaining a new certificate
Performing the following challenges:
dns-01 challenge for mail.send.catalyzerinc.com
dns-01 challenge for send.catalyzerinc.com
Running manual-auth-hook command: /etc/webmin/webmin/letsencrypt-dns.pl
Running manual-auth-hook command: /etc/webmin/webmin/letsencrypt-dns.pl
Waiting for verification…
Challenge failed for domain mail.send.catalyzerinc.com
Challenge failed for domain send.catalyzerinc.com
dns-01 challenge for mail.send.catalyzerinc.com
dns-01 challenge for send.catalyzerinc.com
Cleaning up challenges
Running manual-cleanup-hook command: /etc/webmin/webmin/letsencrypt-cleanup.pl
Running manual-cleanup-hook command: /etc/webmin/webmin/letsencrypt-cleanup.pl
Some challenges have failed.
IMPORTANT NOTES:

• The following errors were reported by the server:

  Domain: mail.send.catalyzerinc.com
  Type: dns
  Detail: DNS problem: NXDOMAIN looking up TXT for
  _acme-challenge.mail.send.catalyzerinc.com - check that a DNS
  record exists for this domain

  Domain: send.catalyzerinc.com
  Type: dns
  Detail: DNS problem: NXDOMAIN looking up TXT for
  _acme-challenge.send.catalyzerinc.com - check that a DNS record
  exists for this domain

[denisremix]

@denisremix

/var/log/letsencrypt/letsencrypt.log

The solution was just to restart apache2 server, very wierd.