udp receiver stops when using win xp sp2

[RPKumar]

I have a UDP receiver application which has been running without problem on my pc with win 2000 and a 10/100 MBps n/w card.One Rabbit core based card is sending data over RF ethernet using two D-link access points . My PC is connected to the accesspoint at receiver side using network cable . Packet size is 4KB and sampling Rate is 2 KHz.Everything is fine.

  Now I have shifted the program to a laptop with XP SP2 and a GB ethernet card. Now the program stops after 20-30 seconds after  receiving a few packets. If I connect the PC directly without RF access points to the Rabbitcore card using n/w cable, it works fine. If i provide a n/w switch at the Tx side then also it works. (switch at the Rx side does not help). But the old PC works well using RF ethernet without switch. Infact the old PC is very slower than the new laptop. this has worked on other old machines also.

i think some speed mismatch problem .is it because of the GB ethernet card ? i have tried changing options in the n/w card like auto, 100 MBps, 10 Mbps etc. then i found from the net that there are some problems in n/w performance when using XP SP2. so i tried the remedies by disabling Firewall and Internet Connection sharing as told in the literature. no improvement.

the laptop is having firewire and WLan also. I have disabled both.

none of these helped and the program works fine in the old PC.

can anyone help ?

[Peter Lamb]

Hi,

Well, this sounds fairly difficult to diagnose, as it appears that a number of things have changed in your setup.  Any more concise details that you could provide would be helpful in determining where the exact source of the problem lies.  Would it be at all possible to try this particular program on another machine, or better yet, multiple other machines?  This might shed some light on where the real culprit is.  Any variables that we could knock out of the picture would be best!

Peter