TN3270 Emulator Displays Corrupted Data (241991)

SYMPTOMS

A TN3270 emulator display screen may contain corrupted data and characters. The display screen appears correctly using a 3270 emulator.

Note: This particular problem does not occur when you use 802.2 DLC and SDLC connections to the host. Host connections that use other types of link services (for example, Channel) may experience this problem.

CAUSE

The SNA Server TN3270 service is an RUI Application. If an RUI application issues an RUI_READ request, but the RUI library (Winrui32.dll) has more data to return than can fit in the calling application's buffer (as specified in lua_max_length), Winrui32.dll returns a primary return code of LUA_OK and a secondary return code of LUA_DATA_INCOMPLETE. When the RUI application issues a subsequent RUI_READ to pick up the remaining data, the data may be corrupted. This data corruption can occur in Winrui32.dll if the "FMI" (3270 message) data received from the SNA Server computer occurs in a certain sequence.

RESOLUTION

SNA Server 3.0

A supported fix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Apply it only to computers that are experiencing this specific problem. This fix may receive additional testing. Therefore, if you are not severely affected by this problem, Microsoft recommends that you wait for the next %1 that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS

NOTE: In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The typical support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

The English version of this fix should have the following file attributes or later for SNA Server 3.0:

File name	Date	Time
Winrui32.dll	09/07/99	12:10

NOTE: Because of file dependencies, the most recent fix that contains the preceding files may also contain additional files.

SNA Server 4.0

To resolve this problem, obtain the latest service pack for SNA Server 4.0. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

215838 How to Obtain the Latest SNA Server Version 4.0 Service Pack

STATUS

Microsoft has confirmed that this is a problem in SNA Server 3.0, SNA Server 3.0 Service Pack 1, SNA Server 3.0 Service Pack 2, SNA Server 3.0 Service Pack 3, SNA Server 3.0 Service Pack 4, SNA Server 4.0, SNA Server 4.0 Service Pack 1, SNA Server 4.0 Service Pack 2, and SNA Server 4.0 Service Pack 3.

This problem was first corrected in SNA Server 4.0 Service Pack 4.