I have a QNX box talking to a Windows XP box through TCP/IP over Ethernet link. The connection is noisy and I see some packet losts, retransmissions happening on the link. After a while QNX box stops sending any packets and Send-Q buffer start increasing in size. QNX box still responds with ACKs to received packets from the Windows XP box.
Could anyone tell me what could be the reason for this?