TLS is updated version of SSL.
Ssl/tls
IP Sec, SSL, TLS
Google uses 2 ports for SMTP most often. On is for SSL and the other is for TLS. SSL is operated on 465 and TLS uses 587.
Hyper Text Transfer Protocol Secure [HTTPS]
Transport Layer This is not correct, it's the session layer of the OSI model SSL was created with the TCP/IP model in mind, not the OSI model. While it is technically true SSL or TLS is in the Session Layer of the OSI, it should be referred to in conjunction with the TCP/IP Model. In this case, it resides above the Transport Layer, providing security for it, hence the name of SSL's successor Transport Layer Security (TLS). Note: TLS 1.0 is SSL 3.1 FYI, please take note the ITU X.800 recommendation states there are no security services provided in the session layer.
The "Err_SSL_Version_or_Cipher Mismatch" error occurs when there is a discrepancy between the SSL/TLS versions or cipher suites supported by your browser and the server you're trying to connect to. This discrepancy can result from outdated browser or server configurations, incompatible cipher suites, or deprecated SSL/TLS protocol versions.
Stunnel is an open source multi-platform computer program. It is used to provide an universal TLS/SSL tunneling service. Stunnel is maintained by Michael Trojnara.
The purpose of the secure sockets layer is a commonly used protocol for managing the security of the messages transferred online. TLS is based on SSL.
Hypertext Transfer Protocol Secure (HTTPS) is a widely used communications protocol for secure communication over a computer network, with especially wide deployment on the Internet. Technically, it is not a protocol in itself; rather, it is the result of simply layering the Hypertext Transfer Protocol (HTTP) on top of the SSL/TLS protocol, thus adding the security capabilities of SSL/TLS to standard HTTP communications. The Secure Socket Layer (SSL) and Transport Layer Security (TLS) is the most widely deployed security protocol used today. It is essentially a protocol that provides a secure channel between two machines operating over the Internet or an internal network. In today's Internet focused world, the SSL protocol is typically used when a web browser needs to securely connect to a web server over the inherently insecure Internet.
HTTPS ( Hypertext Transfer Protocol over SSL/TLS)
Yahoo! Mail POP server: plus.pop.mail.yahoo.comPOP port: 995POP TLS/SSL: yesPOP user name: Your My Yahoo! IDPOP password: Your My Yahoo! passwordYahoo! Mail SMTP server: plus.smtp.mail.yahoo.comSMTP port: 465SMTP TLS/SSL: yesSMTP user name: Your My Yahoo! IDSMTP password: Your My Yahoo! password