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#tls
certs, chains, and the renewal that lapsed at the worst possible moment.
1 blog post · 1 TIL.
Blog posts
Deployed a TLS fingerprinting rule that seemed reasonable. Blocked every Chrome 119 user on Windows. The incident report was not fun to write.
Today I learned
Rotating ciphers exploded our TLS client metrics to 50k unique fingerprints. JA4's split format dropped that to under 200 without losing detection.