[2005] An established connection was aborted!

Hi All,

I've got a really simple/stupid question I'm sure!

I've never really done anything in Vb.NET and sockets so this is my first attempt. Anyway, I want to pull together a simple app that will check a number of ports on a remote machine. Let's say my app will check that port 80, 25 and others are available. So if 25 does not respond I can make a fair assessment that there may be a problem with the SMTP server!

So, the code I thought would be simple....

Code:

Dim tcpClient As New System.Net.Sockets.TcpClient() tcpClient.Connect(<the ip address>, <the port>)

However, using the same ip address I can test port 80 and all is well. If I test port 25 I get an error "A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll" and a popup window tell me that "An established connection was aborted by the software in your host machine" on the tcpClient.Connect line

What am I missing here? Is this the wrong way to do it?

Thanks

David