What should be examined in the ZIA Admin Portal for a failed handshake?

In the context of a failed handshake within the Zscaler Internet Access (ZIA) environment, examining the SSL logs for the transactions is the most appropriate step to take. The reason for this is that a handshake failure often occurs during the process of establishing a secure SSL/TLS connection. SSL logs specifically track the details of the SSL/TLS transactions, including protocol versions, cipher suites, and errors related to the handshake process itself.

When diagnosing a failed handshake, these logs provide critical information about where the failure occurred, whether it was due to certificate validation issues, unsupported cipher suites, or other protocol negotiation problems. By analyzing the SSL logs, an administrator can pinpoint the exact cause of the failure and take corrective action, such as adjusting configurations or resolving issues with the certificates being used.

While traffic flow history, system performance metrics, and user authentication logs all provide valuable insights into the overall functioning of the system, they do not specifically target the problem of a failed SSL handshake. Thus, focusing on the SSL logs is essential for accurately diagnosing and resolving handshake issues in the ZIA Admin Portal.