Dear SCO Customer,

Support Level Supplement (SLS) ptf7672a, the NetBIOS Driver Supplement,
addresses the following problem:

- A UnixWare 7 server using AFPS and netBIOS to connect to clients
  panics during heavy usage.

  This is caused by a procedure being called with a null value,
  which is then dereferenced, resulting in a panic.  SLS ptf7672a
  detects this situation and corrects it.

  The kernel stack for this panic (using kdb) will be similar to:

        nb_ssn_kick+4(0)...........................esp:cc9899a8 ret:ce8fd208
        nbtrsrv+88(cd74fe40).......................esp:cc9899d0 ret:c008460f
        runqueues+af(cc989a24).....................esp:cc9899fc ret:c01342cd
        softint_hdlr+4d(0).........................esp:cc989a10 ret:c01332cf

  Note that the numbers displayed here will differ for each UnixWare
  server, but the routine names will be the same.


Contents
--------

        /etc/conf/pack.d/nb/Driver_atup.o
        /etc/conf/pack.d/nb/Driver_mp.o


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

SLS ptf7672a should only be installed on:

        UnixWare 7 Release 7.1.0, 7.1.1

NOTE:  This supplement has been superseded by
the UnixWare 7.1.1 Maintenance Pack for UnixWare 7.1.1 platforms
only.  The UnixWare 7.1.1 Maintenance Pack is available from:

ftp://ftp.caldera.com/pub/unixware7/uw711pk



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

1. Download the ptf7672a.Z file to the /tmp directory on your machine.

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

        $ su
        Password: <type your root password>
        # uncompress /tmp/ptf7672a.Z
        # pkgadd -d /tmp/ptf7672a
        # rm /tmp/ptf7672a

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: <type your root password>
        # uncompress /tmp/ptf7672a.Z
        # pkgadd -qd /tmp/ptf7672a all
        # rm /tmp/ptf7672a

3. Reboot the system after installing this package.

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

        /var/sadm/pkg/ptf7672/install/ptf7672.txt


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

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

        $ su
        Password: <type your root password>
        # pkgrm ptf7672

2. Reboot the system after removing this package.


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