Issue
When I try to connect to an SSL server I see this error
javax.net.ssl.SSLProtocolException: handshake alert: unrecognized_name
Environment
- CloudBees CI (CloudBees Core) on modern cloud platforms - Managed controller
- CloudBees CI (CloudBees Core) on modern cloud platforms - Operations Center
- CloudBees CI (CloudBees Core) on traditional platforms - Client controller
- CloudBees CI (CloudBees Core) on traditional platforms - Operations Center
- CloudBees Jenkins Enterprise - Managed controller
- CloudBees Jenkins Enterprise - Operations Center
- CloudBees Jenkins Platform - Client controller
- CloudBees Jenkins Platform - Operations Center
- CloudBees Jenkins Distribution
- Jenkins LTS
- JDK >1.7
Resolution
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”: http://bugs.java.com/bugdatabase/view_bug.do?bug_id=7127374
Solution
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.
Workaround
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.
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