title: AWS Route 53 subdomain connected to AWS Lightsail suddenly fails to resolve
body: <p>About a few weeks ago, I linked my Lightsail Wordpress server to <code>example.mysite.com</code> using AWS Route 53.</p>
  <p>Today, I added a security certificate by using <code>sudo /opt/bitnami/bncert-tool</code>. After doing this, the site worked fine and now I had a security certificate.</p>
  <p>Then about 5 minutes later, I noticed that visiting <code>example.mysite.com</code> would return a browser error (<code>This site can’t be reached</code>). Fortunately, visiting the server IP would still work.</p>
  <p>I tried running <code>sudo /opt/bitnami/bncert-tool</code> again, but it complains that <code>example.mysite.com</code> doesn't redirect to the server IP, even though Amazon Route53 says so.</p>
  <p>Interestingly, all my other AWS Route53 A Records that aren't connected to AWS Lightsail work fine.</p>
  <p>I still tried reaching <code>example.mysite.com</code> for 10 minutes, but it didn't work. I tried looking up this error online but that also didn't return anything I needed. Does anyone know how to fix this?</p>