(In reply to Lingshan Zhu from comment #6) > [65874.305417] connection2:0: ping timeout of 5 secs expired, recv timeout > 5, last rx 4311348256, last ping 4311349508, now 4311350760 > [65874.305438] connection2:0: detected conn error (1022) Aha, it strongly back up your conclusion, make sense, thanks!