<p></p>

<h3 dir="auto">Description</h3>
<p dir="auto">Similar to <a href="https://github.com/kamailio/kamailio/issues/1886" data-hovercard-type="issue" data-hovercard-url="/kamailio/kamailio/issues/1886/hovercard">issue #1886</a>, we have Kamailio receiving WebRTC connections from clients and we see many errors related to connections being forcibly closed.<br>
We see two cases where this occurs, the former of which occurs much more often.</p>
<pre><code>Dec 29 01:12:43.909934 tlx-dal-ecv2-staging kamailio_edge[14813]: WARNING: websocket [ws_frame.c:810]: ws_keepalive(): forcibly closing connection
Dec 29 01:12:43.910179 tlx-dal-ecv2-staging kamailio_edge[14813]: ERROR: websocket [ws_conn.c:375]: wsconn_close_now(): getting TCP/TLS connection while trying to close. src_ip:src_port=x.x.x.x:49319, dst_port=443
</code></pre>
<pre><code>Dec 29 00:53:28.110949 tlx-dal-ecv2-staging kamailio_edge[14817]: WARNING: websocket [ws_frame.c:227]: encode_and_send_ws_frame(): TCP/TLS connection get failed
Dec 29 00:53:28.111187 tlx-dal-ecv2-staging kamailio_edge[14817]: ERROR: websocket [ws_frame.c:761]: ping_pong(): sending keepalive. src_ip:src_port=x.x.x.x:46712, dst_port=443
</code></pre>
<h3 dir="auto">Troubleshooting</h3>
<p dir="auto">There seems to be a common occurrence where the WebSocket keepalive will not receive a pong and close the websocket connection. While closing, we see that the underlying TCP connection has already been closed. While that may be harmless, I am concerned there is a race condition that could lead to other problems.</p>
<h3 dir="auto">Additional Information</h3>
<ul dir="auto">
<li><strong>Kamailio Version</strong> - output of <code>kamailio -v</code></li>
</ul>
<pre><code>version: kamailio 5.3.1 (x86_64/linux) d68f5c
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_BLACKLIST, 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: d68f5c
compiled on 07:32:16 Dec 29 2021 with gcc 8.3.0
</code></pre>
<ul dir="auto">
<li><strong>Operating System</strong>:</li>
</ul>

<pre><code>> lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description:    Debian GNU/Linux 10 (buster)
Release:        10
Codename:       buster

> uname -a
Linux tlx-dal-ecv2-staging 4.19.0-8-amd64 #1 SMP Debian 4.19.98-1 (2020-01-26) x86_64 GNU/Linux
</code></pre>

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