Issue

When I try to connect to a SSL server I see this error

 javax.net.ssl.SSLProtocolException: handshake alert: unrecognized_name

Environment

• CloudBees CI (CloudBees Core) on modern cloud platforms - Managed Master
• CloudBees CI (CloudBees Core) on modern cloud platforms - Operations Center
• CloudBees CI (CloudBees Core) on traditional platforms - Client Master
• CloudBees CI (CloudBees Core) on traditional platforms - Operations Center
• CloudBees Jenkins Enterprise - Managed Master
• CloudBees Jenkins Enterprise - Operations Center
• CloudBees Jenkins Platform - Client Master
• CloudBees Jenkins Platform - Operations Center
• CloudBees Jenkins Distribution
• Jenkins LTS
• JDK >1.7

Resolution

With JDK >1.7 you have to add -Djsse.enableSNIExtension=false to Jenkins options or configure properly your server, the reason is a wrong configuration of virtual hosts on the server side. 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

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