16Certificate check
See when a website certificate expires
Inspect the live TLS certificate and record renewal ownership before visitors encounter a browser warning.
BEFORE
AFTER
01 / Do it yourself
From zero to working.
Read the complete sequence before starting. Use a test account or non-production copy whenever the workflow touches important business data.
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01
STEP 1
Run the check against the hostname on port 443.
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02
STEP 2
Confirm the subject or SAN includes the hostname.
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03
STEP 3
Record the expiry date and renewal owner.
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04
STEP 4
Set alerts at least 30 and 7 days before expiry.
02 / Useful starter
Terminal
openssl s_client -connect example.com:443 -servername example.com </dev/null 2>/dev/null | openssl x509 -noout -subject -issuer -dates03 / Check before you change
Useful guardrails.
✓Replace example.com in both places
✓CDNs may manage the certificate
✓Check auto-renew health too
✓Do not paste private keys anywhere
Do it for me
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