Saving or publishing a Confluence page gives "Unable to communicate with server. Saving is not possible at the moment."
Platform Notice: Data Center Only - This article only applies to Atlassian products on the Data Center platform.
Note that this KB was created for the Data Center version of the product. Data Center KBs 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
When attempting to save/publish a Confluence Page, Confluence throws the following error:
"Unable to communicate with server. Saving is not possible at the moment."
Diagnosis
Below Java runtime exception can be seen in the application logs after attempting to Save/Publish the Page:
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java.lang.RuntimeException: Default date value must be strictly before Fri Dec 31 17:18:00 UTC 9999. Listener: com.atlassian.confluence.plugins.tasklist.listener.InlineTasksEventListener event: com.atlassian.confluence.plugins.tasklist.event.ConfluenceTaskV2CreateEvent
Caused by: net.java.ao.ActiveObjectsException: 1709555221694 Fri Dec 31 17:18:00 UTC 9999Cause
There is a Task created on the Page that has an invalid due date.
Confluence will only accept dates before Fri Dec 31 17:18:00 UTC 9999
Solution
Correcting the due date of the Task resolves the issue.
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