3 Oct
2023
3 Oct
'23
10:04 p.m.
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### Description
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Kamailio does not properly release connected WebSocket TCP connections, leading to a
situation where the maximum number of allowable connections is reached and new connection
requests are rejected.
### Troubleshooting
When examining the logs, we identified an issue where Kamailio is failing to release
connected WebSocket TCP connections, causing a backlog of TIME_WAIT connections. The logs
show a warning message indicating that the maximum number of allowable sockets per IP has
been reached, leading to the rejection of further WebSocket requests.
#### Reproduction
Establish WebSocket connections with Kamailio.
Monitor the number of TIME_WAIT connections using netstat.
Observe the warning message in Kamailio logs when the maximum allowable sockets per IP are
reached.
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#### Debugging Data
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```
(paste your debugging data here)
```
#### Log Messages
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```
2023-10-03T13:19:33.699043+00:00 apps001 kamailio[23781]: WARNING:
|<null>|websockets-role.cfg:224 (websocket_request) 223.233.86.93 is at the maximum
50 allowable sockets per IP, rejecting request for another websocket
netstat -punta | grep 223.233.86.93 | grep 5065
tcp 0 0 45.79.166.214:5065 223.233.86.93:52158 TIME_WAIT -
tcp 0 0 45.79.166.214:5065 223.233.86.93:52195 TIME_WAIT -
tcp 0 0 45.79.166.214:5065 223.233.86.93:52292 TIME_WAIT -
tcp 0 0 45.79.166.214:5065 223.233.86.93:52248 TIME_WAIT -
tcp 0 0 45.79.166.214:5065 223.233.86.93:52108 TIME_WAIT -
tcp 0 0 45.79.166.214:5065 223.233.86.93:52071 TIME_WAIT -
```
#### SIP Traffic
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```
(paste your sip traffic here)
```
### Possible Solutions
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request with a fix.
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restarting kamailio solves the problem.
### Additional Information
* **Kamailio Version** - output of `kamailio -v`
```
version: kamailio 5.7.2 (x86_64/linux)
flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST,
DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, MEM_JOIN_FREE, 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: unknown
compiled on 14:39:54 Sep 27 2023 with gcc 7.3.1
```
* **Operating System**:
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CentOS 7.1, ...), MacOS, xBSD, Solaris, ...;
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```
CentOS Linux release 7.9.2009 (Core)
```
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