What actually breaks on websites, why it breaks, and what to do about it. No filler.
A hostname mismatch means the certificate is valid but was not issued for the address in the address bar. The usual causes are a missing www, a new subdomain, or a CDN serving the wrong certificate.
Read the articleExpiry starts a countdown through grace, redemption and pending delete. Each stage costs more to reverse than the last. Here is the timeline and where the deadlines really are.
Read the articleEPP status codes look alarming and usually are not. What each one means, which are protective, which are trouble, and which mean the clock is running.
Read the articleThe error means the certificate is outside its validity window. Here is how to tell whether the fault is your server or the visitor's clock, and how to fix each.
Read the articleHow to tell in under a minute whether a site is down for everyone or only for you, and what each answer points to.
Read the articleThe CA/Browser Forum ballot SC-081v3 cuts maximum certificate validity to 200 days in 2026, 100 in 2027 and 47 in 2029. What changes, and what you have to do about it.
Read the articleWWT watches uptime, certificates, domain expiry and email records around the clock, and tells you before any of them break.