I received an email from you on March 3rd indicating that one of my domains (nthos.com) was affected by the recent bug you found. I renewed the certificate and then checked it using https://checkhost.unboundtest.com/. The response I got was:
unknown: nthos.com: dial tcp 184.108.40.206:443: i/o timeout
I rechecked multiple times over an extended period, and always got the same response. Out of curiosity, I then checked all my other domains using the above URL and found that two more of them (nthos.net and nthos.org) got the same timeout response.
I then created new certificates for all three, but upon testing using the above URL, still get the timeout response.
What exactly is the tool checking, and should I be concerned about the response?