[En-Nut-Discussion] TCP segments lost and zerowindow

[Marcos Pereira]

Hi all,
I'm trying to port ethernut 4.5.6 to IAR STR912-SK board (ST STR9 ARM processor). The system is working, but when I do a TCP/IP loop test using a modified version of rs232d, I see in wireshark that ethernut sometimes loses tcp segments, sometimes it sends zerowindow blocks. The communication performance was degrading until the windows application closes the connection.
I have only two additional threads running in the application.
Thanks for the help,

Marcos