SSL handshake alert unrecognized name


When I try to connect to an SSL server I see this error handshake alert: unrecognized_name



Root cause

The error message is provided by the SNI module (in the JDK >1.7) since the server sends a warning. Browsers are ignoring it, but Java terminates. Oracle means it’s “not a defect”:


Since the error message is related to a wrong configuration of virtual hosts on the server side, the solution is to review your current virtual hosts’ configuration of the server that is reached by the Jenkins instance.


With JDK >1.7 we usually recommended to add -Djsse.enableSNIExtension=false to Jenkins options. However, since some connections like the update center connections, need the enableSNIExtension enabled, we don’t recommend this option anymore.

How to add Java arguments to Jenkins

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