AnsweredAssumed Answered

NO SYN ACK reply for SYN

Question asked by Martin Zhang on Nov 4, 2019
Latest reply on Nov 4, 2019 by Martin Zhang

In my project, I used MQX and RTCS version is 4.2.02, the problem is:

Sometime, when my system received a TCP SYN package and the system will send out a RST message, the SYN ACK will not reply to that SYN message.

After the remote system retransmit the SYN, my system will reply a SYN ACK message.


I have checked the TCP connection number, in my system, the maximum allowed connection number is 5, when this no SYN ACK happened, the connection number is 3.

Someone can tell me why this happened and how can I fix this issue.