### 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
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