thank for repy Alan, <br>for clear, here is my topology<br><br>PC<br>|<br>SW---Router (c3725)<br>|<br>Radius server<br><br><br>when I telnet to the router fromg my PC, the radius server list the clients as &quot;unknow clients&quot;.as soon as I entered the password.<br>

the debug output is as follow:<br><br>&quot;ignoring request to authentication address * port 1812 from unknow client 192.168.6.201 port 1645&quot;<br><br>I&#39;ve also run debug radius mode on the router, and here is the output:<br>

<br>*Mar  1 00:06:03.507: RADIUS: no sg in radius-timers: ctx 0x658A67E4 sg 0x0000<br>*Mar  1 00:06:03.511: RADIUS: Retransmit to (<a href="http://192.168.6.102:1812">192.168.6.102:1812</a>,1813) for id 1645/2<br><br>each time the router retransmit access requess message, the server show the output as above.<br>

<br><br><br><div class="gmail_quote">On 10 May 2010 13:10, Alan DeKok <span dir="ltr">&lt;<a href="mailto:aland@deployingradius.com">aland@deployingradius.com</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">

<div class="im">hafthanhf wrote:<br>
&gt; hi Alan, I have the same problem with Martin, plz help me.. I added<br>
&gt; something in the raddb/clients.conf file as follow:<br>
<br>
</div>  So... run the server in debugging mode as suggested everywhere.<br>
<br>
  READ the debug output.  Is the client listed?<br>
<br>
  READ the debug output.  When it receives a packet, what happens?<br>
<br>
<br>
  My &quot;magical&quot; ability to solve problems is largely a result of reading<br>
the output of the server.<br>
<div><div></div><div class="h5"><br>
  Alan DeKok.<br>
-<br>
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</div></div></blockquote></div><br><br clear="all"><br>-- <br>htt<br>