Hello FS Experts I had posted this Q earlier... posting it again with more details ... I have a FS to which two separate external SBCs connect and uses TLS Intermittently the FS does not respond to TLS client_hello - because of this, we see that sometimes one of the external SBC is not connected at all.. I was able to reproduce this with debug logging enabled and below is the snippet of the same ====================================================================================================================================== nta.c:1289 agent_timer() nta: timer not set tport.c:2753 tport_wakeup_pri() tport_wakeup_pri(0x7f96d01fa670): events IN tport.c:862 tport_alloc_secondary() tport_alloc_secondary(0x7f96d01fa670): new secondary tport 0x7f96d001a9d0 tport_type_tcp.c:203 tport_tcp_init_secondary() tport_tcp_init_secondary(0x7f96d001a9d0): Setting TCP_KEEPIDLE to 30 tport_type_tcp.c:209 tport_tcp_init_secondary() tport_tcp_init_secondary(0x7f96d001a9d0): Setting TCP_KEEPINTVL to 30 tport.c:2644 tport_accept() tport_accept(0x7f96d001a9d0): new connection from tcp/65.14.17.172:13980/sip tport.c:2777 tport_wakeup() tport_wakeup(0x7f96d001a9d0): events IN tport.c:2868 tport_recv_event() tport_recv_event(0x7f96d001a9d0) tport.c:3209 tport_recv_iovec() tport_recv_iovec(0x7f96d001a9d0) msg 0x7f96d0027b90 from (tcp/65.14.17.172:13980) has 183 bytes, veclen = 1 tport.c:2298 tport_set_secondary_timer() tport(0x7f96d001a9d0): reset timer tport.c:2777 tport_wakeup() tport_wakeup(0x7f96d0027f50): events IN tport.c:2868 tport_recv_event() tport_recv_event(0x7f96d0027f50) ======================================================================================================================================== In the above snippet, you can see that the clietn_hello is received ... [highlighted] Please let me know if any of you have encountered such an issue and what the fix is Regards A