SSL

Secure Socket Layer

From the wikipedia:

Transport Layer Security (TLS) and its predecessor, Secure Sockets Layer (SSL), are cryptographic protocols which provide secure communications on the Internet for such things as web browsing, e-mail, Internet faxing, and other data transfers. There are slight differences between SSL 3.0 and TLS 1.0, but the protocol remains substantially the same. The term "TLS" as used here applies to both protocols unless clarified by context.

 

Links

• openssl
• Survival guides - SSL/TLS and SSL (X.509) Certificates
• Check your site
• https://testssl.sh/
• Geekflare, test webserver
• Wormly
• Get certificate chain
• Letsencrypt

Subject Alternative Names

• Multiple SSL Sites Using SubjectAltName

SSL on courier-imap

• http://www.sslshopper.com/courier-imap-ssl-installation-instructions.html

SSL errors

SSL: error:0A000461:SSL routines::reason(1121):SSL alert number 121

Encrypted Client Hello (ECH) error

For Nginx see https://blog.nginx.org/blog/encrypted-client-hello-comes-to-nginx

FAQ

SSL_ERROR_RX_RECORD_TOO_LONG

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