APS-31329 APS sends empty APS-Identity-ID header
Included from previous versions
APS-29634 APS2 propagation fails because RDBMS can't retrieve large number of dns record resources - connection reset by peer error
APS-29257 verification script is not called for multi-step-login
APS-27868 CEP report missed params. VPS licensing affected
POA-94554 Deadlocks on pem.modifyUser plus pem.exchange.addMailboxWithTemplate via aps_registry_object
APS-21329 Can't add domain to aps2 account, if default registrar status is 'Ready' APS-21107 Removing Subscription fails with "Instance of application service with id does not exist"
POA-86790 Service users with Office 365 cannot be removed due to AD observer.
APS-20401 Counters aren't updated properly in PA
Hotfix can be downloaded here.
Use pa_updates_installer (https://kb.cloudblue.com//111323) to install this hotfix. Also this hotfix will be installed automatically during upgrade to OA 5.5.9 via pa_updates_installer. To install hotfix manually obtain its installation package from the link above and follow instructions found in file UPDATE.txt of distributive.