OWASP ASVS V10. 4 Verify that backend TLS connection failures are logged . . . Even basic things like certificate revocation should be a no brainer, but so few libraries enable this by default We see this every day in mobile phone apps - it's trivial to get most mobile apps to connect via MITM proxies that don't provide any user feedback that the connection is untrustworthy I'd like to see this requirement to be:
Common causes of SSL TLS connection issues and solutions You may test with the tools introduced in this blog (TLS connection common causes and troubleshooting guide (microsoft com)) to verify if TLS connection issue was caused by TLS version mismatch
How to discover the attempts of using TLS 1. 0 and 1. 1 after upgrading . . . We understand that you want to effectively monitor and identify failed connection attempts due to clients attempting to use legacy TLS versions (such as TLS 1 0 or 1 1) with your upgraded Azure Application Gateway SSL policy (20220101)
Troubleshooting SSL TLS handshake failures - F5, Inc. After you test SSL connections using a web browser or OpenSSL client, you should review the BIG-IP log files for debug error messages related to the SSL handshake
SSL TLS - Typical problems and how to debug them While SSL TLS is a complex protocol there a some basics one should understand in order to debug and fix most problems: SSL TLS provides encryption and identification Encryption without proper identification (or a pre-shared secret) is insecure, because Man-in-the-middle attacks (MITM) are possible
TLS connection common causes and troubleshooting guide Here in this blog, I will introduce 5 handy tools that can test different phases of SSL TLS connection so that you can narrow down the cause of SSL TLS connection issue and locate root cause