Ack number always equals 1

[Giovanni Parodi <giovanniparodi79 () yahoo it>]

Good morning everyone,
I'm a newbye in networking application and I trying to debug a strange problem that I have sending through TCP protocol 
some data from a DSP based system to a PC application
The problem is that that the application running on PC disconnects after few packets, and so I used wireshark to debug 
the problem. 
It seems some packet get lost (I use a cross cable to connect the devices) and that the system isn't able to recover 
from such a problem.
Furthermore I found out that Acknowledgement number generated by the DSP runnign the server appl always equals 1.
Do you have any idea about some wrong setting that could generate such a behaviour?
Giovanni

Attachment: ack_number.pcap
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