re:Help with test

Hi all, You may have read the post from James Moore (btw: thanks) about the problem I am having at the moment, I need to be able to test this to find out if it is indeed a bug, my problem is that the script I have at the moment is largely dependent on a Online Credit Card Verification (OCV) development server to send requests and receive responses from. What I need is something that would come standard with a Linux distribution that does the same sort of thing i.e. you send a packet of info to it and it responds with an result, this way I should be able to find out if this is a bug, and if so take the appropriate action to help squash it. So if any one has any suggestions of such an application (Linux) that has a generic tcpip interface please let me know and I will give it a whirl. I just can't think of anything at the moment. Any help is always greatly appreciated. Thanks, Joseph Blythe