ssl tls certificates
Why Does My Client Certificate Not Work? Troubleshooting mTLS Client-Side Failures
A troubleshooting guide for client certificates that fail mTLS authentication — key/cert mismatches, missing Extended Key Usage, untrusted client CAs, and how to debug each one.
Łukasz Tomalczyk ·
ssl tls certificates
Why Is My Certificate Not Trusted? A Systematic Troubleshooting Checklist
A step-by-step way to find out why a certificate shows as untrusted — chain, expiry, hostname, clock skew, and revocation — with the exact OpenSSL commands to check each one.
Łukasz Tomalczyk ·
ssl tls certificates
SSL/TLS Certificates: the silent foundation of the internet that too often fails
Why SSL/TLS incidents are rarely about cryptography and mostly about management. Cases and takeaways for engineering teams.
Łukasz Tomalczyk ·