<p>If the port mapping is unsuccessful and you have a UPnP compatible router, make sure:
<ul>
<li>UPnP is enabled. Consult your router's documentation for instructions. If your router doesn't support UPnP, you will have to forward <ahref="pfrouter.html">manually</a>.</li>
<li>DMZ mode is disabled.</li>
<li>The port has not already been forwarded manually.
</ul>
<divid="pagetitle">
<h1>Airport</h1>
</div>
<p>If you have an Apple Airport, make sure NAT-PMP is enabled. To do this:
<divsummary="To do this"id="taskbox">
<ol>
<li>Open Airport Admin Utility</li>
<li>Select your base station and click "Configure".</li>
<li>In the "AirPort" tab, click "Base Station Options...".</li>
<li>In the "Ethernet Port Security" tab, check the "Enable NAT Port Mapping Protocol" checkbox.</li>
<li>Click "OK".</li>
<li>Click "Update".
<p>NB: NAT-PMP requires MacOS X 10.4 Tiger, as well as up to date Airport software and firmware.</li>
</ol>
</div>
<p>If you are still having problems, open the message log (in the Window menu) and post the debug output on the <ahref="http://transmission.m0k.org/forum/viewforum.php?f=2">support forums</a>.