Hostname not verified

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


Unable to execute the migration plan (Server to Cloud) using the Migration Tool.

The following appears in the atlassian-confluence.log

2019-03-18 09:41:29,669 ERROR [Caesium-1-4] [agent.service.stepexecutor.ProgressTracker] error Step failed, message: An unexpected error occurred during step: Migrating attachments. Error: An IO exception occurred when communicating with a downstream service
com.atlassian.migration.agent.okhttp.IOHttpException: An IO exception occurred when communicating with a downstream service
Caused by: Hostname not verified:
    certificate: sha256/xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx=
    DN: CN=*, O="Atlassian Network Services, Inc.", L=San Francisco, ST=California, C=US
    subjectAltNames: [*,]


Diagnostic Steps

  • Check in the Confluence JVM parameters if the following has been configured:



Setting the parameter -Djsse.enableSNIExtension=false means when you connect to a virtual server (which means there are many web servers on one IP address) then it stops the translation of IP address to the domain name. Basically, it stops just about every connection from working.


  • Shutdown Confluence
  • Remove the following parameter from Confluence JVM settings:
  • Start Confluence

Last modified on Jul 21, 2019

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