usage/tips/not_port23.html

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<TITLE>Tips on TCP/IP connection with a port other than 23</TITLE>
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<h1>Telnet port number</h1>

<p>
On the <A HREF="../../commandline/teraterm.html">command line</A>, or on the <A HREF="../../menu/file.html">[File] New connection</A> dialog box, you can specify the TCP port number (&lt;TCP port#&gt;) and telnet flag (&lt;telnet flag&gt;) for a TCP/IP connection. If these parameters are omitted in the command line, the default values are taken from the Tera Term setup file.
</p>

<p>
Only if &lt;telnet flag&gt; is 1 (on) and &lt;TCP port#&gt; is 23, Tera Term starts spontaneously sending telnet commands to the host for the option negotiation when the TCP/IP connection is established.
</p>

<p>
This particular port number for telnet, 23, can be changed by editing the TelPort line in the [Tera Term] section of setup file like the following:
</p>

<pre>
TelPort=&lt;telnet port#&gt;

Default:
TelPort=23
</pre>

<p>
Whatever &lt;TCP port#&gt; is and whatever &lt;telnet flag&gt; is, Tera Term can respond to telnet commands sent by the host.
</p>

<h1>Terminal setup for non-telnet TCP/IP connection</h1>

<p>
For a non-telnet TCP/IP connection (usually with a port other than 23), you may need to set the "local echo" option on, and the "new-line (transmit)" option to CR+LF. If you edit the TCPLocalEcho and TCPCRSend lines in the [Tera Term] section of the setup file like the following:
</p>

<pre>
TCPLocalEcho=on
TCPCRSend=CRLF    (CR is also acceptable)
</pre>

<p>
the "local echo" option is turned on and the "new-line (transmit)" option is set to CRLF automatically when the connection is establised on condition that &lt;telnet flag&gt; is 0 (off), or &lt;TCP port#&gt; is not equal to &lt;telnet port#&gt;. Otherwise, setup values specified by [Setup] Terminal are used. By using these options, one setup file can support both the telnet connection and non-telnet connection.
</p>

<pre>
Default:
TCPLocalEcho=off  (This option is disabled and the "local echo" option in the [Setup] Terminal dialog box is always used.)

TCPCRSend=        (This option is disabled and the "new-line (transmit)" option in the [Setup] Terminal dialog box is always used.)
</pre>

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