Schamil Wackenhut wrote:

> test from client to my server was ok (~90mbit/s), between my client
> and firewall it was ok too, but not between server and firewall...
> So atm i have no ideas, what it could be...

Suboptimal rules on the firewall?
It happens to write rules that work but are slower than necessary, for
example parsing UDP packets in the TCP+UDP rules instead of splitting the
execution paths into TCP rules and UDP rules.
Hope that helps :)