We found the same problem for SDK 2.4.0. The tcp_client can't create the tcp connection with server.
The tcp_client(wiced module) didn't response Ack when the Server(PC) sent an aync ack to client through wireshark network tool analysis. Both lwip and Next Stack have the same problem.
Does anybody have solution for this bug ?
This issue has been resolved in WICED-SDK-2.4.1.