TLS version & cipher check
Confirms your server supports TLS 1.2/1.3, rejects TLS 1.0/1.1, and uses forward-secret cipher suites.
Quick answer
We negotiate handshakes across TLS 1.0-1.3 and record which versions and ciphers your server accepts.
What it checks
- TLS 1.3 supported (+bonus)
- TLS 1.2 supported (required)
- TLS 1.0/1.1 rejected (required for A grade)
- Forward-secret ciphers only (ECDHE-based)
- No RC4, 3DES, or export ciphers
Where to find it in Lemwatch
Site details → Security → SSL.
How to fix
- In nginx/Apache, set
ssl_protocols TLSv1.2 TLSv1.3;.
- Use Mozilla SSL Config Generator's "intermediate" profile.
- Reload the server.
- Re-run the check.
FAQ
Will disabling TLS 1.0 break old clients?
Maybe IE10 on Windows 7. All modern browsers/apps support 1.2+.
Should I enable TLS 1.3 only?
Too aggressive — some corporate proxies stall on 1.3.
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