FlinkTools

SSL certificate

Who issued a site’s certificate, when it expires, and whether the chain is complete.

Checked by our server in Frankfurt
Try an example
Use 465 or 993 for mail servers

Our server checks this from outside your network. We keep only what you save as a report.

Chain, expiry, covered domains and TLS versions appear here.

What it does

Every HTTPS site has a certificate that proves it is the real site. When it expires, browsers show a full-page warning. This check is run by our server, from outside your network.

How to use it

  1. 1Type a domain.
  2. 2Read the expiry date and any issues.
  3. 3Create a free watcher to be told before it expires.

Questions

What does “chain incomplete” mean?

The server is missing an intermediate certificate. Some phones will refuse to connect.

How often should I check?

You don’t have to. A watcher checks once a day and emails you 30, 7 and 1 day before expiry.

Do you store the result?

Only if you save it as a report.

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