But i have more info - the thing is more complex than what i thought:
My sha1 as i calculated it is: 3IRE53N5YXBD2AFSPHPWPMINI53O63DB.
If i change the first I to R or T - it works! meaning the only thing that does not work for me is this particular sha1 or something.

Also - this happens in LimeWire as well. I have the code on my Eclipse so i can debug it and see why the sha1 i've calculated using the LW/FW's code does not work (meaning it does not send me the GET message) but if i destroy it (change it randomally) - it does.

Any thoughts? Maybe where to look in the code (i'm starting digging, i'll see what i come up with).