Dear SCO Customer,

The enclosed Support Level Supplement (SLS) PTF3165, the High Volume Rlogin
Sessions Supplement, allows two SCO UnixWare 2.1.1 and 2.1.2 systems to have
over 512 concurrent rlogin sessions.

SLS PTF3165 has two parts: caller-side software and callee-side software.

Previously, the caller-side rlogin software would only connect using 
reserved ports, since it knew that the connection would be refused by 
the callee.  This PTF provides caller-side software that attempts to call 
despite this concern.  It first tries to use a reserved port; if these are 
all in use, then it uses an unreserved port.  If this PTF is not installed 
on the callee-side, then a connection from an unreserved port will be 
rejected by the callee and the message "Permission denied" will be returned.

Previously, the callee-side rlogin software would reject a call from an 
unreserved port.  SLS PTF3165 provides callee-side software which, when 
called with a particular option, accepts rlogin calls on any port.  
Specifically, PTF3165 modifies rcmd.c in libsocket by adding a boolean 
datum ReservedRequired that will set to False if in.rlogind is invoked 
with a "-i" parameter. The in.rlogind.c file was modified to parse the 
command line for the new "-i" option and unset ReservedRequired if the 
option is provided.

Configuration - Callee side
===========================

To set up your machine to receive more than 512 rlogins from another, 
install this PTF and then edit /etc/inetd.conf.  There is a line in this 
file that reads like this:

 login stream tcp nowait root /usr/sbin/in.rlogind in.rlogind

change it to this:

 login stream tcp nowait root /usr/sbin/in.rlogind in.rlogind -i

As implied by the above, SLS PTF3165 must be installed on the UnixWare 
system that originates the rlogin connection as well as the UnixWare 
system that's to terminate the connection.


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

SLS PTF3165 can be installed on:

     SCO UnixWare Application Server Release 2.1.1, 2.1.2

As stated above, the implementation of this feature requires changes on
both the originating and terminating UnixWare systems.


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

1. Become root and create a new directory by typing the following:

     $ su
             (Password: <type your root password>)
     # mkdir /tmp/pkg
     # chmod 700 /tmp/pkg
     # cd /tmp/pkg

2. Download the ptf3165.Z and the ptf3165.txt files to the newly
   created /tmp/pkg directory on your machine.

3. Read the Release Notes contained in the ptf3165.txt file.

4. Add the package to your system using the following commands:

     # zcat /tmp/pkg/ptf3165.Z | pkgadd -d -

   Alternately, you can uncompress the PTF and install it as follows:

     # uncompress ptf3165.Z
     # pkgadd -d /tmp/pkg/ptf3165

5. Reboot the system after installing this PTF.


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

1. Become root and remove the package by typing these commands:

     $ su
             (Password: <type your root password>)
     # pkgrm ptf3165

2. Reboot the system after removing this PTF.


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

We appreciate your business.

SCO Support Services