We have upgrade Pc1 from Xp->Win7
Before upgrade, the socket communication has no problem
i) Pc1 send command (3bytes) -> Pc2, Pc2 will response 3 to 20bytes
ii) Pc1 send command (3bytes) -> Pc2, Pc2 will response 1Mbytes (images data)
- this take about 25ms

After upgrade, the socket communication has problem
i) Pc1 send command (3bytes) -> Pc2, Pc2 will response 3 to 20bytes
- this has no problem
ii) Pc1 send command (3bytes) -> Pc2, Pc2 will response 1Mbytes (images data)
- pc1 receive 1024bytes
- no data for about 5sec
- pc1 receive 1024bytes
- no data for about 5sec ...
... this continue for very long

1. Pc1 did not change any hardware
2. Pc1/Pc2 did not change any s/w
3. Pc1 Nic:Intel(R) PRO/1000 PL (no change)
4. Pc2 Nic:Intel(R) 82574L Gigabit
5. Both network running at 1Gpps/Full duplex
6. Pc1 Win7 network driver:9.15.11.0

Please help...