It is likely a firewall problem. Unless you have a connectivity problem. 
Does ping work ?
Use a sniffer on the W2K PC to see if the UDP datagrams are received or not.

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----- Original Message ----- 
From: <[EMAIL PROTECTED]>
To: <twsocket@elists.org>
Sent: Monday, February 26, 2007 7:26 PM
Subject: [twsocket] ICS


> Hi,
>
> I'm rather new to this mailinglist but I've a question for a newbie on
> the ICS component. Hope that somebody can help me with this issue or
> point me in a certain direction.
>
> I've created a delphi 7 programme with the WSocket. It works fine on
> my development PC. It communicates between the PC and a DDC controller
> on two UDP ports (5556 transmitting to the controller and 9876 for
> receiving on the PC). It works fine! My platform is Windows XP Pro.
>
> Now I've copied just my exe-file to a Windows 2000 Pro PC. It doesn't
> receive anything from the controller after sending the correct
> commands. I've shipped the file to other computers with Windows XP Pro
> and some work and some don't work. What's wrong ?
>
> Because I'm working with TCP/IP components I've looked to firewall's
> or other blockers but that's not the issue here. Does anybody had a
> similar problem ? Does anybody have an idea or can point me in a
> direction where I can find a solution?
>
> Thanks for all the help !
>
> Jim
>
>
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