SNA Server Windows 3.x Client Causes Access Violation on Windows 98

ID: Q241138

The information in this article applies to:

Microsoft SNA Server, versions 3.0, 3.0 SP1, 3.0 SP2, 3.0 SP3, 3.0 SP4, 4.0, 4.0 SP1, 4.0 SP2, 4.0 SP3

SYMPTOMS

The SNA Server Windows 3.x client software (Wnap.exe and Win3270.exe) may fail with an Access Violation error in the following configurations:

When you install on a computer running Windows 98 Second Edition

After you install Microsoft Internet Explorer 5 on Windows 98, where the SNA Win 3.x client had been working with no problems prior to the upgrade to Internet Explorer 5

On computers running Windows 98, the Access Violation error message may be similar to the following:

WNAP caused a general protection fault
in module WNAP.EXE at 0005:00000a10.
Registers:
EAX=ffff2864 CS=2eb7 EIP=00000a10 EFLGS=00000246
EBX=014f2864 SS=2e87 ESP=000025ca EBP=000025de
ECX=00000000 DS=2e87 ESI=00022d50 FS=2e7f
EDX=00002f2f ES=2f2f EDI=00002e6f GS=0000
Bytes at CS:EIP:
ff 1e c4 0c c4 1e 2c 01 26 c7 87 35 27 02 00 b8

Stack dump:

28642eef 2d502f2f 62002e6f 28648928 2e872f2f 043425fd 2eef2ec7
2e6f2d50 00000200 00032f2f 2e872622 2eef0b90 270f2e87 17d79e9d
00000000 00100000

CAUSE

When you run the SNA Windows 3.x client on the above Windows 98 configurations, the SNA client components are exhausting their local program stack space, which results in unexpected failures in the SNA client components.

RESOLUTION

A supported fix that corrects this problem is now available from Microsoft, but it has not been fully regression tested and should be applied only to systems experiencing this specific problem. If you are not severely affected by this specific problem, Microsoft recommends that you wait for the next Microsoft SNA Server version 4.0 service pack that contains this fix.

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 on support costs, please go to the following address on the World Wide Web:

http://www.microsoft.com/support/supportnet/overview/overview.asp

The English version of this fix should have the following file attributes or later:

File name	Date	Time
Wnap.exe	09/03/99	12:24p
Win3270.exe	09/03/99	8:19p

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

WORKAROUND

If the problem started to occur after you installed Microsoft Internet Explorer 5, to work around the problem, remove Internet Explorer 5 and install a previous version of Internet Explorer.

STATUS

Microsoft has confirmed this to be a problem in SNA Server 3.0, 3.0 SP1, 3.0 SP2, 3.0 SP3, 3.0 SP4, SNA 4.0, 4.0 SP1, 4.0 SP2, 4.0 SP3.

MORE INFORMATION

The updated Wnap.exe and Win3270.exe files have increased their program stack allocations from 8 KB to 16 KB each. The SNA Windows 3.x client has not been updated since SNA Server 4.0 SP1. To apply this fix to the SNA Server 3.0 client, the client should first be upgraded to SNA Server 4.0 SP1 before this update is applied.

Additional query words:

Keywords : sna4 sna4sp1 sna4sp2 sna4sp3
Version : WINDOWS:3.0,3.0 SP1,3.0 SP2,3.0 SP3,3.0 SP4,4.0,4.0 SP1,4.0 SP2,4.0 SP3
Platform : WINDOWS
Issue type : kbbug