I cannot get NLogViewer to receive msgs from local machine.

My machine is Windows 7.

I am able to get a remote machine to send NLog messages to my local box and NLogViewer on my local box shows the message fine.

But, if I run an app locally, and config NLog to spit messages to my local box, NLogViewer doesn't get the messages.

Here's my config:

<targets>
  <target name="viewer" xsi:type="NLogViewer" address="udp://localhost:4050"/>
</targets>

<rules>
 <logger name="*" minlevel="Info" writeTo="viewer" />
<rules>

Is it Windows 7 security? I have config'd Windows Firewall to allow UDP port 4050 inbound and outbound.

My apps are an ASP.NET site and a few windows services.