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15 Guides

Troubleshooting

Debug and fix SSL/TLS errors. Solutions for certificate failures, chain issues, revocation problems, and common misconfigurations.

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Troubleshooting - Guide Series
Certificate Failure Scenarios
Troubleshooting

Certificate Failure Scenarios

Common SSL/TLS errors and how to fix them. Expired certs, chain issues, name mismatches.

8 minInteractive
Git SSL Certificate Errors
Troubleshooting

Git SSL Certificate Errors

Fix "SSL certificate problem: unable to get local issuer certificate" for clone, push, pull. Corporate proxy and self-signed cert solutions.

15 min
Python SSL Certificate Errors
Troubleshooting

Python SSL Certificate Errors

Fix CERTIFICATE_VERIFY_FAILED in pip, requests, and conda. Corporate proxy solutions included.

10 min
CRL vs OCSP vs Stapling
Troubleshooting

CRL vs OCSP vs Stapling

Certificate revocation methods compared. Understand how browsers check if certificates are revoked.

7 minInteractive
Revocation Deep Dive
Troubleshooting

Revocation Deep Dive

Advanced revocation topics: OCSP responders, CRL distribution points, and stapling implementation.

8 minInteractive
Wildcard Certificate Dangers
Troubleshooting

Wildcard Certificate Dangers

Security risks of wildcard certificates and when to avoid them.

5 minInteractive
Chain Builder
Troubleshooting

Chain Builder

Build and validate certificate chains. Fix missing intermediate certificate issues.

6 minInteractive
Certificate Error Decoder
Troubleshooting

Certificate Error Decoder

Decode cryptic SSL/TLS errors. Get plain English explanations and fix suggestions.

5 minInteractive
ERR_SSL_VERSION_OR_CIPHER_MISMATCH: What It Means and How to Fix It
TroubleshootingNEW

ERR_SSL_VERSION_OR_CIPHER_MISMATCH: What It Means and How to Fix It

ERR_SSL_VERSION_OR_CIPHER_MISMATCH means no shared TLS version or cipher suite. Diagnose it in one command, then fix nginx, Apache, IIS, F5, or Java.

14 min
SAN Explainer
Troubleshooting

SAN Explainer

Subject Alternative Names demystified. Multi-domain and wildcard SAN configurations.

5 minInteractive
CSR Decoder & Checker
Troubleshooting

CSR Decoder & Checker

Decode and validate your Certificate Signing Request. Check key size, SANs, signature algorithm, and common issues before CA submission.

4 minInteractive
HSTS Explainer
Troubleshooting

HSTS Explainer

HTTP Strict Transport Security explained. Preloading, max-age, and implementation.

5 minInteractive
Name Mismatch Errors
Troubleshooting

Name Mismatch Errors

Fix certificate name mismatch errors. Common causes and solutions.

4 minInteractive
Let's Encrypt Troubleshooting
Troubleshooting

Let's Encrypt Troubleshooting

Fix common Let's Encrypt issues. Rate limits, challenge failures, and renewal problems.

7 minInteractive
SSL/TLS Troubleshooter
Troubleshooting

SSL/TLS Troubleshooter

Diagnose SSL/TLS connection issues step by step. Interactive troubleshooting workflow.

6 minInteractive