title: Error Installing SSL Certificate via Let's Encrypt in Plesk
body: <p>Invalid response from <a href="https://acme-v01.api.letsencrypt.org/acme/authz/6aiPKoMlUey-DC8yNvbvyZX7UaW5gISaGimggJnnICk" rel="nofollow noreferrer">https://acme-v01.api.letsencrypt.org/acme/authz/6aiPKoMlUey-DC8yNvbvyZX7UaW5gISaGimggJnnICk</a>.</p>
  
  <p>Details:</p>
  
  <p>Type: urn:acme:error:connection</p>
  
  <p>Status: 400</p>
  
  <p>Detail: dns :: DNS problem: NXDOMAIN looking up A for webmail.tradethon.com</p>
  
  <p>please help for solving issue </p>