Unrecognized SSL message, plaintext connection?

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This article only applies to the Atlassian server platform. Learn more about the differences between cloud and server.

Symptoms

The following appears in the atlassian-crowd.log:

2014-04-21 11:43:31,503 http-bio-8095-exec-4 INFO [service.soap.client.SecurityServerClientImpl] Existing application token is null, authenticating ...
2014-04-21 11:43:31,517 http-bio-8095-exec-4 ERROR [xfire.transport.http.HttpChannel] javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?
2014-04-21 11:43:31,524 http-bio-8095-exec-4 ERROR [crowd.console.action.Login] Failed to connect to the authentication server, please check your crowd.properties
org.springframework.security.authentication.AuthenticationServiceException: Could not invoke service.. Nested exception is org.codehaus.xfire.fault.XFireFault: Couldn't send message.
Caused by: org.codehaus.xfire.XFireRuntimeException: Could not invoke service.. Nested exception is org.codehaus.xfire.fault.XFireFault: Couldn't send message.
Caused by: org.codehaus.xfire.fault.XFireFault: Couldn't send message.
Caused by: javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?

Cause

Java 7 introduced SNI support which is enabled by default. Certain misconfigured servers send an "Unrecognized Name" warning in the SSL handshake which is ignored by most clients, except for Java.

Resolution

  • Add the following to the JAVA_OPTS environment variable:
    -Djsse.enableSNIExtension=false
  • Restart your Crowd instance.



DescriptionUnrecognized SSL message, plaintext connection? error appears in the atlassian-crowd.log
Last modified on Dec 31, 2018

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