at404 - 2007-04-28

Hy,
I have a problem with connection s7-300 on ISO-TCP.
I have more pc with libnodave in VB Program that have a connection on same plc.
For the first all go fine but for the 2 and 3 connection I have an error: "TimeOut for PLC response"
If I have s7 connected I have same problem.
Any solution?
thanks