If a client uses OpenSSL to initiate an SSL 3 handshake, the handshake fails. If such clients use the TLS/SSL of earlier versions to initiate handshakes to a server, handshakes will directly fail as the server does not support the TLS/SSL of earlier versions.įor example, Taobao only supports TLS 1.0 or later versions. However, some old operating systems and browsers still exist. To ensure security, servers often support only the TLS1.0 and later versions. Since the release of TLS 1.2 in 2008, most HTTPS traffic runs on TLS 1.2. Now, let's deep dive into the various TLS/SSL handshake failure scenarios. In the case of session multiplexing, the handshake is simplified to ensure completion in only one RTT. Compared to the preceding method, this handshake process requires an extra step, where the client transfers a certificate to the server.Ī full handshake completes in two Round Trip Times (RTTs) and involves the exchange of multiple messages. Thus, this mode implies two-way authentication. The client needs to authenticate the server, and the server also needs to authenticate the client. This is an authentication mode that has requirements for security of clients. In this mode, the certificate is on the server and the client checks whether the server is reliable based on the certificate.Ģ) Full Handshake with Server Authentication This is an authentication mode used for most HTTPS traffic on the Internet. 1) Full Handshake with Mutual Authentication This section introduces the three types of TLS/SSL handshakes and describes the entire handshake process for each type. This article summarizes various handshake failure scenarios and outlines the root causes and symptoms of handshake failure under different scenarios. Furthermore, the integration of products and features such as security on Alibaba Cloud may bring more unstable factors to the TLS/SSL handshake process. A handshake between the transport layer security (TLS) and the secure sockets layer (SSL) is a complex process.
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