Sockets + Windows Server 2008 = Memory Leak

[Torrs]

Hello,

We have a small service shows continuous nonpaged pool bytes increase from the moment it is started. This is only on a 2008 server (all the others work fine).

The service basically connects a socket to a client to see if it's successful and then closes (most code omitted):

Try
    client = New System.Net.Sockets.Socket(System.Net.Sockets.AddressFamily.InterNetwork, System.Net.Sockets.SocketType.Stream, System.Net.Sockets.ProtocolType.Tcp)
    client.LingerState = New System.Net.Sockets.LingerOption(False, 0)
    client.ReceiveBufferSize = 1024
    client.SendBufferSize = 1024
    client.Connect(address, _port)
Catch

Finally
    'Release the socket.
    If client IsNot Nothing AndAlso client.Connected Then
        client.Shutdown(System.Net.Sockets.SocketShutdown.Both)
        client.Disconnect(True)
        client.Close(5)
        client = Nothing
    End If

It does also call an asynchronous BeginReceive() but I've commented that part out and the leak is still evident. The code is inside a timer, and gets called by a configurable amount. I've tried many things in code, and also upgrading the project to use the 3.5 Framework combined with the suggestions here:

http://msdn.microsoft.com/en-us/magazine/cc163356.aspx

But it still increases by 15.36 bytes every iteration. Some resources just aren't being released?!

Many thanks in advance,

Phil