Blog / SSL & domains

SSL & domains

Certificates and domain registrations: what to watch, what breaks when they expire and how to fix it.

ERR_SSL_PROTOCOL_ERROR: What It Means and How to Fix It

ERR_SSL_PROTOCOL_ERROR means the TLS handshake broke before any certificate check. Causes and fixes, tested with openssl s_client, curl and nmap.

6 min read

What Happens When an SSL Certificate Expires?

An expired SSL certificate triggers browser warnings and breaks APIs, webhooks and mobile apps. What users see, how to fix it fast and how to prevent it.

6 min read

What Happens When a Domain Expires? The Stages, Step by Step

When a domain expires, the site and email stop working, then come renewal grace, a 30-day redemption period and pending delete. Timelines and prevention.

6 min read

SSL Certificate Monitoring: What to Check and When to Alert

What SSL certificate monitoring should check (expiry, host names, chain, issuer), how far ahead to alert, and the renewal automation mistakes to watch for.

7 min read

NET::ERR_CERT_COMMON_NAME_INVALID: What It Means and How to Fix It

NET::ERR_CERT_COMMON_NAME_INVALID means the certificate does not cover the host name you visited. Wildcard rules, common causes and fixes.

6 min read

Missing Intermediate Certificate: Fixing an Incomplete SSL Chain

An incomplete SSL chain works in some browsers but fails in curl, apps and APIs. Why, how to detect it with openssl, and how to serve the full chain.

6 min read

47-Day SSL Certificates: The Lifetime Schedule and What It Means

Public TLS certificates drop to 200 days in 2026, 100 days in 2027 and 47 days in 2029. The exact dates, the validation reuse changes and how to prepare.

6 min read