Troubleshooting SSL certificates
Also read SSL Certificate Basics
Is SSL active? SSL Checker
Validation Methods – DNS vs HTTP
SSL Labs: SSL Labs is most helpful for cryptographic issues on an already set up HTTPS site,.
Use for:
a) Some browsers work properly and others give a ciphersuite-related error
Let’s Debug: Use For:
Failed challenges and why the challenge is failing.
Check-Your-Website:
a) Some browsers work properly and others don’t
b) The site returns failed challenges that are not meaningful.
Why No Padlock: Why No Padlock is most helpful if you already have a certificate but all or some users don’t see a valid HTTPS connection (and it gives very specific information about what’s causing mixed content warnings)
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