A fix is available
APAR status
Closed as program error.
Error description
A Telnet client using TN3270E logs on to a VTAM application. The VTAM application sends a BIND to the client which contains a x'FF' in the data. Telnet must add a x'FF' to the data. Telnet will split the bind into two messages. This can cause the data to be sent as two packets to the Telent client. Some Telnet clients can not handle the VTAM bind being split over two packets and will hang or present a black screen. .
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: All users of the IBM Communications Server * * for z/OS Version 1 Release(s) 12 and 13 IP: * * Telnet facilities. * **************************************************************** * PROBLEM DESCRIPTION: Client emulation software does not * * properly process an application * * BIND which is split into multiple * * packets. * **************************************************************** * RECOMMENDATION: * **************************************************************** The problem may be summarized as follows: 1. A TN3270E client connected to the Telnet server and logged on to a target host application. 2. As part of the session establishment process, the host application sent a BIND to the Telnet server. The user data portion of the BIND image contained a x'FF' byte. Telnet server processing of the BIND image converted the x'FF' to a x'FFFF'. This process is denoted as 'IAC stuffing' and occurs so the client can distinguish a x'FF' in the application data from an IAC. 3. The IAC stuffing caused the BIND image to be sent to the client in multiple packets. The client emulation software was unable to correctly process the BIND in multiple packets, and the first data panel from the host application was not displayed. +-------------------------------------------------------------+ + Please check our Communications Server for OS/390 homepages + + for common networking tips and fixes. The URL for these + + homepages can be found in Informational APAR II11334. + +-------------------------------------------------------------+
Problem conclusion
The following modules have been amended to perform IAC stuffing (converting a x'FF' to a x'FFFF') in the same message triple (SKMB) when a BIND image is being processed: - EZBTPSTF - EZBTPCCO - EZBTPLMO - EZBTRTFO * Cross Reference between External and Internal Names
Temporary fix
Comments
APAR Information
APAR number
PM58576
Reported component name
TCP/IP V3 MVS
Reported component ID
5655HAL00
Reported release
1C0
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2012-02-20
Closed date
2012-03-20
Last modified date
2012-05-02
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UK77192 UK77193
Modules/Macros
EZBTPCCO EZBTPLMO EZBTPSTF EZBTRTFO
Fix information
Fixed component name
TCP/IP V3 MVS
Fixed component ID
5655HAL00
Applicable component levels
Fix is available
Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.
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Document Information
Modified date:
02 May 2012