Dear SCO Customer,

Support Level Supplement (SLS) ptf7633d, the UnixWare 7.1.1 libnsl and timod
Driver Supplement, contains modifications to address networking-related errors
in the t_sync library call, as well as in some RPC routines and in NIS name
resolution.

 SLS ptf7633b addressed the following issues:

  1. t_listen fails with t_error TBADQLEN.  In a TLI/XTI application using
     t_sync, the qlen value for the specified transport endpoint can be
     incorrectly set to zero locally within the transport library.  The
     negotiated qlen field of a transport endpoint is now correctly updated
     when t_sync is called.

  2. Some RPC routines, upon encountering an error condition, fail to clean
     up partially-built connections.  In the case of TCP/IP, this can result
     in unused endpoints remaining in the CLOSE_WAIT state.  A T_DISCON_REQ
     is now sent down the stream to ensure orderly cleanup.

  3. NIS name resolution can cause memory corruption for some applications,
     often resulting in random core dumps generated by a SIGSEGV.  A memory
     allocation for an internal structure was increased to the correct size.

 SLS ptf7633c addressed the following issue:

  4. Informix 7.3 application (esql/c binary) runs successfully on UnixWare
     7.1.0, but causes a disconnect on UnixWare 7.1.1.

 SLS ptf7633d addresses the following issue:

  5. With NIS enabled the JDK 1.2.2 rmiregistry command core dumps with a
     SIGSEGV.

 Contents
 --------

         /usr/lib/libnsl.so
         /usr/lib/libnsl_i.so
         /usr/lib/libnsl.so.1
         /etc/conf/pack.d/timod/Driver_atup.o
         /etc/conf/pack.d/timod/Driver_mp.o
         /usr/include/sys/timod.h

 Software Notes and Recommendations
 ----------------------------------

 SLS ptf7633d should only be installed on:

         UnixWare 7 Release 7.1.1

 Installation Instructions
 -------------------------

 1. Download the ptf7633d.Z file to the /tmp directory on your machine.

 2. As root, uncompress the file and add the SLS package to your
    system using these commands:

         $ su
         Password:
         # uncompress /tmp/ptf7633d.Z
         # pkgadd -d /tmp/ptf7633d
         # rm /tmp/ptf7633d

    Alternatively, this SLS package may be installed in quiet mode,
    that is, without displaying the release notes and asking for
    installation confirmation.  To do this, use these commands:

         $ su
         Password:
         # uncompress /tmp/ptf7633d.Z
         # pkgadd -qd /tmp/ptf7633d all
         # rm /tmp/ptf7633d

 3. Reboot the system after installing this SLS package.

 The release notes displayed prior to installation can be found in:

         /var/sadm/pkg/ptf7633/install/ptf7633.txt

 Removal Instructions
 ---------------------

 1. As root, remove the SLS package using these commands:

         $ su
         Password:
         # pkgrm ptf7633

 2. Reboot the system after removing this SLS package.

 If you have questions regarding this SLS, or the product on which
 it is installed, please contact your software supplier.