TN5250 Event ID 16 Error Causing APPC Session To Fail

ID: Q182374

The information in this article applies to:

Microsoft SNA Server, versions 3.0, 3.0 SP1, 3.0 SP2, 3.0 SP3, 4.0

SYMPTOMS

In some situations, such as performing a screen save from a TN5250 session to the AS400, the APPC session fails (the AS/400 rejects one of the messages) and an Event ID 16 is logged from the TN5250 Service on the SNA Server computer with the following text:


   The SNA TN5250 Service detected an unexpected passthrough parameter 
   data area flag from the client at <data>.

   The client should not generate this information and it has been
   suppressed. Please verify that the client software has all fix
   updates applied.

CAUSE

In some cases, the data flow comes across two socket calls. The TN5250 Service is incorrectly handling the second call, causing the problem to occur.

RESOLUTION

SNA Server 4.0

This problem was corrected in the latest SNA Server version 4.0 U.S. Service Pack. For information on obtaining this Service Pack, query on the following word in the Microsoft Knowledge Base (without the spaces):

S E R V P A C K

SNA Server 3.0

To resolve this problem, obtain the latest service pack for SNA Server version 3.0. For additional information, please see the following article in the Microsoft Knowledge Base:

Q184307 How to Obtain the Latest SNA Server Version 3.0 Service Pack

STATUS

Microsoft has confirmed this to be a problem in Microsoft SNA Server, versions 3.0, 3.0 SP1, 3.0 SP2, 3.0 SP3, 4.0. This problem was first corrected in SNA Server 3.0 Service Pack 4.

MORE INFORMATION

With the update applied, the TN5250 Service functions correctly in this situation.

Additional query words:

Keywords : kbfix4.00.sp1 snaappc snatn5250
Version : WINDOWS:3.0,3.0 SP1,3.0 SP2,3.0 SP3,4.0
Platform : WINDOWS
Issue type : kbbug