Unable to migrate Confluence Server to Data Center due to "The address 'null' is not a valid network address" error
Platform Notice: Data Center - This article applies to Atlassian products on the Data Center platform.
Note that this knowledge base article was created for the Data Center version of the product. Data Center knowledge base articles for non-Data Center-specific features may also work for Server versions of the product, however they have not been tested. Support for Server* products ended on February 15th 2024. If you are running a Server product, you can visit the Atlassian Server end of support announcement to review your migration options.
*Except Fisheye and Crucible
Summary
The migration of Confluence Server to Confluence Data Center fails after configuring the Data Center settings in the UI.
Environment
Confluence Data Center, migrated from Server version.
Diagnosis
After adding the Data Center cluster values and proceeding with the setup, this error appears in the UI:
"Error occurred during template rendering. Contact your administrator for assistance."The following error appears in the atlassian-confluence.log file during the setup:
Could not get cluster config from configuration file: The address 'null' is not a valid network addresCause
This error is caused by a misconfiguration within the proxy/load balancer that prevents Confluence redirects through the configured front end URL.
Solution
Bypass the load balancer and proxy and access the Confluence datacenter node directly using the server name and direct port to proceed with the migration to datacenter. It's suggested to the network administrators to review the load balancer per our Load balancer configuration options guide.