There Once Was a Sysadmin...

Published 2019-05-07 on Matthew's Blog

That sysadmin really enjoyed working on silly programs in his free time, he even runs a few websites! Oftentimes, this sysadmin is fairly surprised he has a real job as a Systems Engineer/Web Developer.

This is one of those times.

I recently decided to switch my domains’ name servers from CloudFlare to FastMail. There were a few reasons for this, all of which turned out to be the wrong answers to the original questions.

It all started when I had set to redirect to I kept getting Invalid Certificate errors since the domain was but the server is (and the certificate was for) I spent a good few months perplexed why there would be an issue, “mail dot” all my other domains worked just fine, after all.

So I went ahead and switched name servers on all of my domains to FastMail’s domain servers. This accomplishes several things:

  1. I don’t have to worry about configuring all the MX, TXT, and other records related to mail systems.
  2. FastMail is much more convenient for me to access than CloudFlare.
  3. I don’t necessarily require DDoS protection (which I wasn’t paying for anyhow).
  4. FastMail makes it incredibly easy to serve a file or directory from my file storage at FastMail.

Unfortunately, all of the existing issues remained and I even added a few issues to the list! was still returning certificate errors. Additionally, wasn’t being resolved at all. dig-ing at,,, and were all returning SERVFAIL for

This was frustrating to say the least, but I learned a valuable lesson throughout this process that I have yet to put into practice. Documentation is important.


It turns out there was an HTTP Strict Transport Security (HSTS) directive tucked neatly away in an Nginx snippet. I don’t remember putting it there, perhaps Ghost did that automatically when I upgraded. After removing the HSTS directive and forcing Firefox to “Forget About This Site”, my domain was behaving as expected! was still giving me trouble, though, and it was worse than Certain DNS resolvers would return a SERVFAIL while others would return NOERROR with the correct values. I was baffled! Why in the hell are some resolvers working while others, especially the “big name” resolvers weren’t?! Turns out the answer was simple and if I weren’t so curious, perhaps I could have avoided this issue altogether.

There was a DNSSEC record for 🙄

After some quick research, I learned one of the better methods to changing name servers with a DNSSEC record is to delete the record at the Registrar, wait 24 hours, delete the record at the name server, and then change name servers.

I changed name servers, was looking into this for a few days, and then deleted the record at the registrar.

At the time of this writing,,, and still return SERVFAIL. I’ll give it 24-48 hours until I continue the investigation.

And maybe I’ll start a local wiki to keep domain, DNS, and security configurations in a central location.

How am I employed in this industry, again?

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I'm a systems administrator, front-end and back-end developer, and an IT guru in Minneapolis, MN. It’s nice to meet you.