Writing

Grouping bot traffic by IP or user-agent falls apart under proxy rotation and header spoofing — and even the right grouping key is useless if the scan that computes it can't finish. Here's how JA4 fingerprint clustering and a KV-checkpointed batch scan solved both.

A 522 means Cloudflare couldn't even open a TCP connection to your origin — here's how to tell that apart from a slow origin, and where to actually look first.

A legitimate request blocked by a managed WAF rule isn't a reason to disable the ruleset — it's a reason to scope one narrow exception.

NXDOMAIN and SERVFAIL are not the same failure. Conflating them sends troubleshooting toward record content when the real problem is somewhere else entirely.

IBM CIS quietly serving an ECDSA-only Let's Encrypt certificate broke handshakes for a legacy IBM Sterling client — here's why re-trusting the new CA wasn't enough, and what actually fixed it.