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 openssl
How to Generate an SSL Certificate: OpenSSL Step-by-Step Guide (Self-Signed & CSR)
A practical, copy-pasteable guide to generating SSL/TLS certificates with OpenSSL — private keys, self-signed certs, CSRs, and Subject Alternative Names.
Łukasz Tomalczyk ·