Symptom
When managed Mac OS X clients are restricted to opening specific applications, Apple Remote Desktop clients become unavailable.
Solution
In certain scenarios when managing application access via Workgroup Manager, the process ARD Helper (/System/Library/CoreServices) may not be running. This can cause Remote Desktop clients to become unavailable. If this occurs, log out and then log back in to automatically relaunch the ARD Helper process.
Removing restrictions on applications in Workgroup Manager will resolve this.
If removing restrictions on applications is not preferred, allowing unbundled applications to launch is an alternative solution. For more information on allowing unbundled applications to launch, see technical document 107659, "
Workgroup Manager: How to Allow Use of Unbundled Applications".