The Data Integration features (DRDA AR and DRDA AS) that are included with Microsoft Host Integration Server 2013 are supported for use with the following IBM Relational Database management systems:
IBM DB2 for z/OS V9.1 and V10
IBM DB2 for i5/OS V6R1 and V7R1
IBM DB2 for Windows, AIX, HP-UX, Solaris, and Linux V9.7 and V10
IBM Informix IDS V11.7 and V12.1
This software update adds support for the following new IBM DB2 for z/OS versions:
IBM DB2 for z/OS V11
IBM DB2 for Windows, AIX, HP-UX, Solaris, and Linux V10.5
Cumulative update information
The update that adds support for the new IBM DB2 for z/OS versions is included in Cumulative Update 2 for Host Integration Server 2013.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.