TN3270 Incorrectly Logs Event 902 - TCPRecv Internal Error

ID: Q182269

The information in this article applies to:

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

SYMPTOMS

Under certain timing conditions, the SNA Server TN3270 service may log the following event:

Event ID: 902
Source: TN3270 Server
Description: Logic error in module TCPRecv identified by:
IOAlreadyOutstanding

EXPLANATION
An unexpected logic error has occurred.

ACTION
Record message and contact technical support.

However, this does not cause any TN3270 client connectivity problems. This event has been reproduced when the Wall Data Rumba TN3270 client is connected through the SNA Server TN3270 service configured to use an SNA Server 3270 demo link service or to an actual host application.

CAUSE

In certain timing conditions, the TN3270 service was posting a second TCP/IP receive request against a socket, while a previous receive command was already outstanding. This is a benign condition and should not be logged.

STATUS

Microsoft has confirmed this to be a problem in SNA Server 3.0 (all service packs) and SNA Server 4.0. We are researching this problem in SNA Server version 3.0 and will post more information here in the Microsoft Knowledge Base as it becomes available.

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

MORE INFORMATION

With this update applied, the TN3270 service no longer logs this specific error condition.

Additional query words:

Keywords : kbfix4.00.sp1 snatn3270
Version : WINDOWS:3.0,3.0 SP1,3.0 SP2,4.0
Platform : WINDOWS
Issue type : kbbug