TN3270 Client Ignoring Keyboard Lock (180929)


The information in this article applies to:

  • Microsoft SNA Server 3.0
  • Microsoft SNA Server 3.0 SP1
  • Microsoft SNA Server 3.0 SP2
  • Microsoft SNA Server 4.0
This article was previously published under Q180929

SYMPTOMS

A TN3270 client may send data to the TN3270 Service even though the keyboard should have been locked.

CAUSE

The client is sending data before the host has sent a Change Direction (CD) or End Bracket (EB). In a trace, behavior similar to the following may be seen:
  1. Host sends Begin Bracket (BB) and no CD, with RU=F5C3D7C1, (locking the keyboard).
  2. TN3270 Server sends a 05C1D7C1 to the client.
  3. SNA Server sends a +rsp to the Host.
  4. Client sends in the first part of the data, 7D40C4C1... (ignoring the keyboard lock).
  5. Client sends in the rest of the data.
  6. Host sends CD (Unlocking the keyboard).
  7. TN3270 Server sends 01C2FFEF to the client.

STATUS

Microsoft has confirmed this to be a problem in SNA Server versions 3.0, 3.0 SP1, 3.0 SP2, and 4.0.

This problem was corrected in the latest SNA Server versions 3.0 and 4.0 U.S. Service Packs. For information on obtaining these Service Packs, query on the following word in the Microsoft Knowledge Base (without the spaces):

S E R V P A C K

MORE INFORMATION

The fix alters SNA Server's TN3270 behavior by queuing the messages from the TN3270 client until a CD or EB is received from the host.
Modification Type:MinorLast Reviewed:4/27/2005
Keywords:kbbug kbfix KB180929
©2004 Microsoft Corporation. All rights reserved.