I'm using the following code to call a web service that exists on up to 4
servers. I would expect that execution would block on the call to WaitAll
(I've got a 15 minute timeout coded) until there is a response from all the
web service calls. In my case the code exits WaitAll immediately and blocks
instead on the call to EndGetServerContents. Any ideas why I'm seeing this
behavior?

// get the contents of each server in the site to audit
int NumberOfServersInSite = SelectedSite.Servers.Count;

PrinterManagerWsProxy[] PrinterManagerWsProxies = new
PrinterManagerWsProxy[NumberOfServersInSite];
IAsyncResult[]          AsyncResults = new
IAsyncResult[NumberOfServersInSite];
WaitHandle[]            WaitHandles = new WaitHandle[NumberOfServersInSite];
ServerContents[]        SiteConfigurations = new
ServerContents[NumberOfServersInSite];
for(int i=0; i<NumberOfServersInSite; i++)
{
   PrinterManagerWsProxy proxy = new PrinterManagerWsProxy();
   proxy.Url = "soap.tcp://" + SelectedSite.Servers[i].Name + ":" +
Properties.Settings.Default.PrinterManagerWsProxyPort + "/PrinterManagerWs";
   PrinterManagerWsProxies[i] = proxy;
   AsyncResults[i] = proxy.BeginGetServerContents(true, null, null);
   WaitHandles[i] = AsyncResults[i].AsyncWaitHandle;
}

// wait for web service calls to return ... could do other work here if
there is any
WaitHandle.WaitAll(WaitHandles,
Properties.Settings.Default.PrinterManagerWsProxyTimeout, false);

// get web service call results
for (int i = 0; i < NumberOfServersInSite; i++)
{
   if (AsyncResults[i].IsCompleted)
   {
    SiteConfigurations[i] =
PrinterManagerWsProxies[i].EndGetServerContents(AsyncResults[i]);
   }
   else
   {
    PrinterManagerWsProxies[i].Abort();
    SiteConfigurations[i] = null;
    MessageBox.Show(string.Format("Unable to get configuration information from
server {0}, results do not include this server.",
SelectedSite.Servers[i].Name), "Error!", MessageBoxButtons.OK,
MessageBoxIcon.Error);
   }
}