Your main site almost certainly works. You would have noticed if it did not. The interesting question is what the other twenty names on your domain are doing: the staging box someone set up in 2021, the IPv6 address that never got the new certificate, the mail server nobody has logged into since the migration.
SSLBoard answers that question in about a minute, from the outside, with no access to your servers.
Run a scan
- Go to sslboard.com and type the domain, for example
example.com. Not a URL, not a hostname: the registrable domain. - Clear the browser check if you get one, then start the scan.
- Watch discovery run first, then inspection. Discovery collects names to try; inspection connects to them.
- Open the report and read the priority findings from the top.
That is the whole setup. You do not install an agent, upload a private key, or open a firewall rule.
What you get back
| The report covers | Which answers |
|---|---|
| Deployed certificates, expiry, issuers | What is actually being served, right now, on each address |
| TLS versions and cipher suites | Whether a 2014-era protocol is still reachable |
| Forward secrecy and key profiles | Whether recorded traffic stays safe if a key leaks later |
| HTTP redirects, HSTS, security headers | What a browser is told to do before it trusts you |
| DNSSEC, CAA | Whether DNS answers and certificate issuance are constrained |
| Mail routing, STARTTLS, SPF, DMARC, MTA-STS, DANE | Whether mail to and from you is protected in transit and hard to spoof |
| Connection failures | Where the scan could not establish anything, and why |
That last row matters more than it looks. A check that could not run is not a check that passed. Missing, failed, and inconclusive results explains how to tell them apart.
Fix one thing, not everything
The most common mistake is treating the report as a scorecard to grind upward. It is more useful as a to-do list sorted by blast radius.
Say the report shows an expired certificate on old.example.com while www.example.com is clean. The useful sequence is: decide whether old is still needed, find where its TLS connection actually terminates (often not where you think), then either replace the certificate there or retire the service. Retest and confirm the endpoint now serves what you intended.
One finding closed end to end beats five categories nudged upward.
What a scan is not
It is a point-in-time observation of your public surface. It does not test your application for vulnerabilities, it does not log in to anything, and it does not certify you against a compliance framework. If a check has no usable evidence, the report says so rather than guessing.
Next: how SSLBoard gets its data, or skip ahead to reading your report.