### Description If call has ended with BYE after 180/183 before 200 OK, kamailio tries to create new connection to destination, not to use existing. With firewall enabled and TLS transport this is issue. ### Troubleshooting #### Reproduction Load topos module, register client (asterisk, it shows port 5061 in contact but real query comes from random tcp port) using TLS, make call to it, terminate call with BYE, before answering. #### Log Messages [kamailio-topos.gz](https://github.com/kamailio/kamailio/files/1505189/kamai… #### SIP Traffic [topos-by-befor-ack.tar.gz](https://github.com/kamailio/kamailio/files/15051… ### Additional Information version: kamailio 5.2.0-dev1 (x86_64/linux) flags: STATS: Off, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MEM, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144, MAX_LISTEN 16, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB poll method support: poll, epoll_lt, epoll_et, sigio_rt, select. id: unknown compiled on 09:24:06 Nov 27 2017 with gcc 4.8.5 * **Operating System**: Red Hat Enterprise Linux Server 7.3 3.10.0-514.el7.x86_64 #1 SMP Wed Oct 19 11:24:13 EDT 2016 x86_64 x86_64 x86_64 GNU/Linux -- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: https://github.com/kamailio/kamailio/issues/1339