Hello alls!
My problem is in traffic disappearence between server & client.
I want determine how investigate reasons of this issue and solve,
so I am looking for discussion and prompts more, than for mperfect solution(of course, I
appreciate solution but...)

So, what takes place:
Server and client both are self written, unblockjng sockets and TCP/IP protocol.
Transmission over internet, server and client are deeply protected by firewalls.
More, server now installed on JVM.

Behavior: Traffic between S&C starts perfectly, in test mode I am able regulate packets number
and traffic accordingly. But at random moment traffic goes down practically to zero, after few seconds traffic again comes to normal. On serevr side I have state WSAWOULDBLOCK at these moments.
Look at attached screen, where real traffic is red and expected one is blue.
The main problem now how to find and chech reason for traffic lost, and how to solve this problem. Because quasereal time and 100% packets are critical for this apllications.
Thanks alot for your ideas.