LDAP synchronization never completes - Too many users added to cache
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
Problem
LDAP appears to synchronize without end. In Administration > User Directories, it can be seen that more users are being added to the LDAP cache than anticipated.
For example, an instance that anticipates 400 users:
Synchronising for 1655s…
Last synchronised at 2/23/16 10:53 AM (took 2s).
Adding 34,556 users to the cache.
Cause
This will happen when only the base DN information is provided and filter settings are too broad or the default settings have not been modified.
Resolution
Ensure that user and group DN settings are configured so filtering narrows down how many users are synced/added to cache.
For reference, use these resources that discuss creating LDAP filters:
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