### Description I have faced with an issue in Kamailio 5.6 when tcp closed reset by peer on remote side but Kamailio dont executing route block "event_route[websocket:closed]".

### Kamailio minimal config file ####### Global Parameters #########

listen=udp:192.168.31.81:5060 listen=tcp:192.168.31.81:5060 listen=tcp:192.168.31.81:7000

tcp_accept_no_cl=yes

######## Kamailio control connector module ######## loadmodule "tm.so" loadmodule "ctl.so" modparam("ctl", "binrpc_buffer_size", 4096) loadmodule "pv.so" loadmodule "sl.so" loadmodule "xlog.so" loadmodule "nathelper.so" loadmodule "xhttp.so" loadmodule "websocket.so" loadmodule "ipops.so" loadmodule "siputils.so" loadmodule "rr.so" loadmodule "usrloc.so" loadmodule "registrar.so"

request_route { if(method=="REGISTER"){ save("location"); exit; } }

event_route[xhttp:request] { set_reply_close(); set_reply_no_connect();

xlog("L_WARN", "websocket|log|connection from $si received!\n");

if ($hdr(Upgrade)=~"websocket" && $hdr(Connection)=~"Upgrade" && $rm=~"GET") {

if (ws_handle_handshake()) { exit; } } xhttp_reply("404", "Not found", "", ""); }

event_route[websocket:closed] { xlog("L_WARN", "websocket|log|connection from $si closed!\n"); }

#### Reproduction ###Kamailio started and client sipml5 connected [root@centos8 kamailio]# sh /root/run_kamailio.sh Listening on udp: 192.168.31.81:5060 tcp: 192.168.31.81:5060 tcp: 192.168.31.81:7000 Aliases: tcp: centos8.local.tst:7000 tcp: centos8.local.tst:5060 udp: centos8.local.tst:5060

15(29286) WARNING: <script>: websocket|log|connection from 192.168.31.100 received!

### closing tcp connection by remote side C:\Users\Alex>netstat -ano | findstr :7000 TCP 192.168.31.100:51688 192.168.31.81:7000 ESTABLISHED 9624 C:\Users\Alex>taskkill /pid 9624 /F SUCCESS: The process with PID 9624 has been terminated.

### issue reproduced 17(29288) ERROR: <core> [core/tcp_read.c:272]: tcp_read_data(): error reading: Connection reset by peer (104) ([192.168.31.100]:51688 ->17(29288) ERROR: <core> [core/tcp_read.c:274]: tcp_read_data(): -> [192.168.31.81]:7000) 17(29288) ERROR: <core> [core/tcp_read.c:1478]: tcp_read_req(): ERROR: tcp_read_req: error reading - c: 0x7f47d5134ad0 r: 0x7f47d5134bf8 (-1)

And nothing else but I am expecting something like that: this is output from Kamailio 5.5 where the issue not reproduced.

13(39207) WARNING: websocket [ws_frame.c:227]: encode_and_send_ws_frame(): TCP/TLS connection get failed 13(39207) ERROR: websocket [ws_frame.c:761]: ping_pong(): sending keepalive 14(39208) WARNING: <script>: websocket|log|connection from 192.168.31.100 closed!

Also additional output ws.dump [root@centos8 kamailio]# kamcmd ws.dump { connections: { } info: { wscounter: 0 truncated: no } }

### Possible Solutions I found a commit which called this behavior https://github.com/kamailio/kamailio/commit/3033b7681b4240fd64c9f1ff446b529a...

If I was built Kamailo without this commit, the issue not reproduced, also the issue not reproduced in Kamailio 5.5 or older.

### Additional Information

``` [root@centos8 kamailio-5.6]# kamailio -v version: kamailio 5.6.4 (x86_64/linux) a004cf flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, 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_BLOCKLIST, HAVE_RESOLV_RES, TLS_PTHREAD_MUTEX_SHARED ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB poll method support: poll, epoll_lt, epoll_et, sigio_rt, select. id: a004cf compiled on 11:09:28 Mar 6 2023 with gcc 8.5.0

```

* **Operating System**:

``` [root@centos8 kamailio-5.6]# cat /etc/centos-release CentOS Stream release 8 ```