WCF discovery client unable to find services that can be individually reached

Question

I'm trying to add ad-hoc discovery to a simple WCF service-client setup (currently implemented by self hosting in a console app). Debugging using VS2010 on windows 7, and doing whatever I can find in online tutorial, but still - the discovery client simply finds nothing. Needless to say if I open a client to the correct service endpoint I can access the service from the client.

service code:

using (var selfHost = new ServiceHost(typeof(Renderer)))
{
    try
    {
        selfHost.Open();
        ...
        selfHost.Close();

service app.config:

<?xml version="1.0"?>
<configuration>
  <system.serviceModel>
    <services>
      <service name="TestApp.Renderer">
        <host>
          <baseAddresses>
            <add baseAddress="http://localhost:9000" />
          </baseAddresses>
        </host>
        <endpoint address="ws" binding="wsHttpBinding" contract="TestApp.IRenderer"/>
        <endpoint kind="udpDiscoveryEndpoint"/>
      </service>
    </services>
    <behaviors>
      <serviceBehaviors>
        <behavior>
          <serviceDiscovery/>
          <serviceMetadata httpGetEnabled="True"/>
        </behavior>
      </serviceBehaviors>
    </behaviors>
  </system.serviceModel>
</configuration>

client discovery code:

DiscoveryClient discoveryClient = new DiscoveryClient(new UdpDiscoveryEndpoint());
var criteria = new FindCriteria(typeof(IRenderer)) { Duration = TimeSpan.FromSeconds(5) };
var endpoints = discoveryClient.Find(criteria).Endpoints;

The 'endpoints' collection always comes out empty. I've tried running the service and client from the debugger, from a command line, from an admin command line - everything, but to no avail (all on the local machine, of course, not to mantion I'll need it running on my entire subnet eventually)

Any help would be appreciated :-)

Answer 1

Damn! it was the firewall... for some reason all UDP communication was blocked - disabling the firewall solved the problem. Now I only need to figure out the correct firewall configuration...