ACSSyncService.exe and/or ACSLogServer.exe take up 100% of CPU constantly without going down.
ACSAlets.log contains errors similar to the following:
![2009/01/09 16:35:51.249] (3) Error :<AD Receiver> (30825) Failed to remove object <CN=John Smith,CN=Quest Collaboration Services Objects,OU=Europe,DC=nordic,DC=company,DC=com> from collection <Europe>. Code : 0x80040432,Description : 00002098: SecErr: DSID-03150A45, problem 4003 (INSUFF_ACCESS_RIGHTS), data 0
This is caused by the service account lacking necessary permissions.
Check if the service account has all rights as per QCS User Guide:
-Read access to Active Directory
-Replicate Directory Changes right for all domains in the forest from which objects will be published
-Manage Replication Topology right for all domains in the forest from which objects will be published
-Write, create, and delete objects rights for the Collaboration Services container and child containers
-Delete objects right for all containers with objects that are subject to conflict resolution via deletion
-Write permission for all objects that are subject to matching
-Modify group membership right for all groups whose members can be affected by conflict resolution via deletion or matching
-Member of builtin/administrators group on the QCS server.
Please note that Collaboration Services is a CPU-intensive application and it is recommended to have a dedicated server for QCS. If CPU usage is reaching 100% but doing that in spikes, this is a normal behavior of the product. This article only applies to a situation with permanent 100% CPU usage and this specific error in the log file
