TN3270 Client Ignoring Keyboard Lock

 Last reviewed: February 13, 1998
Article ID: Q180929
The information in this article applies to:
  • Microsoft SNA Server, versions 3.0, 3.0 SP1, 3.0 SP2, 4.0

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.

A supported fix is now available, but has not been fully regression-tested and should be applied only to systems experiencing this specific problem. Unless you are severely impacted by this specific problem, Microsoft recommends that you wait for the next Service Pack that contains this fix. Contact Microsoft Product Support Services for more information.

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. 

Keywords          : kbbug3.00 kbbug3.00.sp1 prodsna snatn3270 kbbug3.00.sp2 kbbug4.00
Version           : WINDOWS:3.0,3.0SP1,3.0SP2,4.0
Platform          : WINDOWS
Issue type        : kbbug
Solution Type     : kbfix

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Last reviewed: February 13, 1998
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