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News
TLS certificates, actually explained, no hand-waving
1+ week, 3+ day ago (1587+ words) Most developers use TLS constantly and understand it vaguely, "it's the padlock, it means encrypted," without a clear picture of what's actually happening or, more usefully, what actually breaks and why when a cert issue takes down production. Let me…...
The Certificate That Expired at 2:03 AM
2+ week, 4+ day ago (439+ words) https://appdirs.com/ At 2:02 AM, everything was working. At 2:03 AM, users started receiving connection errors. The servers were running. CPU and memory were …...
Stop saying SSL: TLS only does three jobs, and your 'SSL cert' is usually not the outage
2+ week, 5+ day ago (330+ words) Runbooks still say "renew the SSL certificate" when the browser warning is obsolete protocol. The certificate can be brand new. The tunnel is still TLS 1.0. This is a shortened English note. The tables, handshake diagram, and OpenSSL CLI checks live…...
Your first shortened TLS certificates expire in September – 4sysops
2+ week, 5+ day ago (34+ words) Public TLS validity dropped from 398 days to 200 days on March 15, 2026, the first of three cuts on the way to 47 days in March 2029. Most CAs moved early, so c...