You try to shut down the Microsoft Service for Distributed Relational Database Architecture (DRDA) while there are still active DRDA sessions. However, the service gets stuck in a status of Stopping and cannot be controlled.
This problem occurs when a disconnect is not returned in a timely manner.
Cumulative update information
The fix that resolves this problem is included in Cumulative Update 1 for Microsoft Host Integration Server 2013.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.