Hello, We've been having this boggling SCTP_COMM_LOST occurring in our application. And it's only occurring on some machine but we can't figure out what's going on. The SCTP_COMM_LOST occurred ~2.192848s after init on alice side, and alice closed the socket(no abort sent to bob based on wireshark). Alice didn't have any pending send or retransmission when SCTP_COMM_LOST was received. Bob still unaware on the comm lost on alice, so when it sent a message to alice (data sent base on wireshark) at around ~14.043s after init, Alice immediately responded an abort presumably because the socket was already closed. How would we know what caused the SCTP_COMM_LOST on alice side? System information is: Linux kiwi313 3.16.0-7-amd64 #1 SMP Debian 3.16.59-1 (2018-10-03) x86_64 GNU/Linux Best Regards, Prinz Buyo