<para>If you have lot of <command>telnet</command>, <command>ssh</command>, X, or <command>screen</command> users,

	  <para>If you have a lot of telnet, ssh, X, or screen users,

            you will probably run out of pseudoterminals.  Here is how to

	    you might run out of pseudoterminals.  By default,

            add more:</para>

	    &os; 6.2 and earlier support 256 pseudoterminals, while

	    &os;&nbsp;6.3 and later support 512 pseudoterminals.</para>

            <procedure>

	  <tip>

              <step>

	    <para>If needed, more pseudoterminals can be added.

                <para>Build and install a new kernel with the line in

	      However, this requires patching the standard C library,

                  the configuration file:</para>

	      the kernel, and <filename>/etc/ttys</filename>.  For

	      example, <ulink

                <programlisting>device pty <replaceable>N</replaceable></programlisting>

		url="http://www.freebsd.org/~jhb/patches/pty_1152.patch"></ulink>

	      expands the number of pseudoterminals to 1152.  Note that

                <para>where <replaceable>N</replaceable> is the number

	      the patch will only apply cleanly to &os; 6.3 or

                  of requested pseudoterminals.</para>

	      later.</para>

              </step>

	  </tip>

              <step>

                <para>Edit <filename>/etc/ttys</filename> and add lines

                for each of the <replaceable>N</replaceable> terminals.  They should match the form

                of the existing entries, i.e. they look like this:</para>

                <programlisting>ttyqc none network</programlisting>

                <para>The order of the letter designations is

                  <literal>tty[pqrsPQRSlmnoLMNO][0123456789abcdefghijklmnopqrstuv]</literal>, using a

                  regular expression.</para>

              </step>

              <step>

                <para>Reboot the system with the new kernel and you are

                  ready to go.</para>

              </step>

            </procedure>

	  <note>

	    <para>Using more than 256 (up to 512) &man.pty.4; devices requires

	      &os;&nbsp;6.3 or later.</para>

	  </note>