The SNA Manager MMC snap-in may exit unexpectedly when you try to assign a link service (for example, SNAIP1) to a connection through the Connection Properties dialog box. This problem occurs in Microsoft Host Integration Server 2009.
When the SNA Manager MMC snap-in tries to access a handle that was not initialized correctly, an access violation causes the snap-in to close.
Cumulative update information
Host Integration Server 2009
The fix that resolves this problem is included in Cumulative Update 7 for Host Integration Server 2009.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.