<h3>Description</h3>

<p>We're trying to connect the same subscriber with Kamailio for load testing. Sometimes it registers successfully but sometimes it throws the following error.</p>
<h3>Troubleshooting</h3>
<p>From my understanding by checking the source code, TLS_WR_MBUF_SZ is set as 65536 by default. This is the reason for "write buffer too small". Can someone help me with how to change that?</p>
<h4>Reproduction</h4>

<p>I don't exactly know how to reproduce as some the clients pass and some fail.</p>
<h4>Debugging Data</h4>

<pre><code>(paste your debugging data here)
</code></pre>
<h4>Log Messages</h4>

<p>BUG: tls [tls_server.c:849]: tls_encode_f(): write buffer too small (65536/65536 bytes)<br>
ERROR: websocket [ws_frame.c:300]: encode_and_send_ws_frame(): sending WebSocket frame<br>
ERROR: websocket [ws_frame.c:800]: ws_frame_transmit(): sending message<br>
NOTICE: <script>: WebSocket connection from a.b.c.d:1234 has closed<br>
ERROR: registrar [reply.c:745]: reg_send_reply(): failed to send 200 OK<br>
ERROR:  [core/tcp_main.c:3502]: handle_ser_child(): received CON_ERROR for 0x7f9472eec990 (id 100), refcnt 4, flags 0x4018<br>
NOTICE: <script>: Error in saving location data<br>
WARNING: sl [../../core/forward.h:173]: msg_send_buffer(): TCP/TLS connection for WebSocket could not be found<br>
ERROR: sl [sl_funcs.c:362]: sl_reply_error(): stateless error reply used: I'm terribly sorry, server error occurred (1/SL)<br>
WARNING:  [core/tcp_read.c:1716]: handle_io(): F_TCPCONN connection marked as bad: 0x7f9472eec990 id 100 refcnt 1</p>
<h4>SIP Traffic</h4>

<h3>Possible Solutions</h3>

<p>Need to increase the default tls write buffer size from 65536. I think it is set as<br>
"#define TLS_WR_MBUF_SZ    65536"</p>
<h3>Additional Information</h3>
<ul>
<li><strong>Kamailio Version</strong> - output of <code>kamailio -v</code></li>
</ul>
<p>version: kamailio 5.0.8 (x86_64/linux) c35e69<br>
flags: STATS: Off, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MEM, 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<br>
ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144, MAX_LISTEN 16, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB<br>
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.<br>
id: c35e69<br>
compiled on 05:04:45 Nov 25 2019 with gcc 4.8.5</p>
<ul>
<li><strong>Operating System</strong>:</li>
</ul>

<p>Linux 3.10.0-957.21.3.el7.x86_64 <a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="31891578" data-permission-text="Title is private" data-url="https://github.com/kamailio/kamailio/issues/1" data-hovercard-type="issue" data-hovercard-url="/kamailio/kamailio/issues/1/hovercard" href="https://github.com/kamailio/kamailio/issues/1">#1</a> SMP Tue Jun 18 16:35:19 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux</p>
<p>CentOS Linux release 7.7.1908 (Core)</p>

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