### Description On our setup with Kamailio 5.2.1 with users connected via TLS. i see frequently TCP/TLS sessions remain in CLOSE_WAIT: netstat -ntp |grep CLOSE tcp 238 0 172.17.217.10:5061 xxx.xxx.xxx.218:52613 CLOSE_WAIT 117912/kamailio tcp 4681 0 172.17.217.10:5061 xxx.xxx.xxx.125:8892 CLOSE_WAIT 117912/kamailio In tcpdump i see, that the client send a TCP FIN,ACK and and the OS which is hosting the Kamailio send TCP ACK. But Kamailio is not closing. So the session remain in CLOSE_WAIT for a long time (over a hour) We also have configured: tcp_connection_lifetime=65 modparam("tls", "connection_timeout", 63) Which should finally close after 65 second. But no effect. ### Troubleshooting #### Reproduction Register SIP clients via TLS, and then let the client close the TCP session ia TCP FIN,ACK * **Operating System**: Debian GNU/Linux 9 -- 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/1881