Saving/Publishing a Confluence Page gives "Unable to communicate with server. Saving is not possible at the moment." due to invalid Task due date.

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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

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:

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 9999


Cause

There is a Task created in the Page that is given an invalid due date.
Example:

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.

Last modified on Mar 8, 2024

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