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    <tt>Hi, Dawid!<br>
      <br>
      I think the error appears when the Networking send buffers are
      full. If your system has enough resources, you can try to increase
      the memory used by the buffers[1].<br>
      <br>
      [1] <a class="moz-txt-link-freetext" href="https://www.cyberciti.biz/faq/linux-tcp-tuning/">https://www.cyberciti.biz/faq/linux-tcp-tuning/</a><br>
      <br>
      Best regards,<br>
    </tt>
    <pre class="moz-signature" cols="72">Răzvan Crainea
OpenSIPS Solutions
<a class="moz-txt-link-abbreviated" href="http://www.opensips-solutions.com">www.opensips-solutions.com</a></pre>
    <div class="moz-cite-prefix">On 07/26/2017 08:21 PM, Dawid Mielnik
      wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:CAOkGNoeUXKBSxb0bp4c9gDw6_5Gm8ngbHwLb43P3a1wcgrDxFg@mail.gmail.com">
      <div dir="ltr">Hi Liviu,
        <div><br>
        </div>
        <div>Exact version info:</div>
        <div><br>
        </div>
        <div>
          <div>version: opensips 2.2.2 (x86_64/linux)</div>
          <div>flags: STATS: On, DISABLE_NAGLE, USE_MCAST, SHM_MMAP,
            PKG_MALLOC, F_MALLOC, FAST_LOCK-ADAPTIVE_WAIT</div>
          <div>ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144,
            MAX_LISTEN 16, MAX_URI_SIZE 1024, BUF_SIZE 65535</div>
          <div>poll method support: poll, epoll_lt, epoll_et, sigio_rt,
            select.</div>
          <div>git revision: 9eb177d</div>
          <div>main.c compiled on 11:43:55 Nov  3 2016 with gcc 4.4.7</div>
        </div>
        <div><br>
        </div>
        <div>BR,</div>
        <div>Dawid</div>
      </div>
      <div class="gmail_extra"><br>
        <div class="gmail_quote">On Wed, Jul 26, 2017 at 7:09 PM, Liviu
          Chircu <span dir="ltr"><<a
              href="mailto:liviu@opensips.org" target="_blank"
              moz-do-not-send="true">liviu@opensips.org</a>></span>
          wrote:<br>
          <blockquote class="gmail_quote" style="margin:0 0 0
            .8ex;border-left:1px #ccc solid;padding-left:1ex">
            <div text="#000000" bgcolor="#FFFFFF">
              <p><tt>Hi Dawid,</tt></p>
              <p><tt>This seems to have been fixed a long time ago [1],
                  so I'm a bit puzzled. Just to be 100% sure, can you
                  try to locate the exact binary path your OpenSIPS
                  service is running on, and figure out the exact
                  version that way? (e.g. output of
                  "/usr/local/sbin/opensips -V")<br>
                </tt></p>
              <p><tt>[1]: <a
                    class="m_-7893340486897713857moz-txt-link-freetext"
href="https://github.com/OpenSIPS/opensips/commit/d3aaf44c"
                    target="_blank" moz-do-not-send="true">https://github.com/OpenSIPS/<wbr>opensips/commit/d3aaf44c</a></tt><br>
              </p>
              <pre class="m_-7893340486897713857moz-signature" cols="72">Liviu Chircu
OpenSIPS Developer
<a class="m_-7893340486897713857moz-txt-link-freetext" href="http://www.opensips-solutions.com" target="_blank" moz-do-not-send="true">http://www.opensips-solutions.<wbr>com</a></pre>
              <div>
                <div class="h5">
                  <div class="m_-7893340486897713857moz-cite-prefix">On
                    26.07.2017 19:11, Dawid Mielnik wrote:<br>
                  </div>
                </div>
              </div>
              <blockquote type="cite">
                <div>
                  <div class="h5">
                    <div dir="ltr">
                      <div>Hi All,</div>
                      <div><br>
                      </div>
                      <div>Can you help me understand the cause of these
                        error messages ?</div>
                      <div><br>
                      </div>
                      <div>[...]</div>
                      <div>Jul 26 09:56:00.259767 ERR 32258
                         ERROR:core:proto_udp_send:
                        sendto(sock,0x7fb4817b3ba8,<wbr>563,0,0x7fb484c23f10,16):
                        Resource temporarily unavailable(11)</div>
                      <div>Jul 26 09:56:00.259813 ERR 32258
                         ERROR:core:proto_udp_send:
                        sendto(sock,0x7fb4817b3ba8,<wbr>563,0,0x7fb484c23f10,16):
                        Resource temporarily unavailable(11)</div>
                      <div>Jul 26 09:56:00.259822 ERR 32258
                         ERROR:core:proto_udp_send:
                        sendto(sock,0x7fb4817b3ba8,<wbr>563,0,0x7fb484c23f10,16):
                        Resource temporarily unavailable(11)</div>
                      <div>Jul 26 09:56:00.259831 ERR 32258
                         ERROR:core:proto_udp_send:
                        sendto(sock,0x7fb4817b3ba8,<wbr>563,0,0x7fb484c23f10,16):
                        Resource temporarily unavailable(11)</div>
                      <div>Jul 26 09:56:00.259839 ERR 32258
                         ERROR:core:proto_udp_send:
                        sendto(sock,0x7fb4817b3ba8,<wbr>563,0,0x7fb484c23f10,16):
                        Resource temporarily unavailable(11)</div>
                      <div>Jul 26 09:56:00.259847 ERR 32258
                         ERROR:core:proto_udp_send:
                        sendto(sock,0x7fb4817b3ba8,<wbr>563,0,0x7fb484c23f10,16):
                        Resource temporarily unavailable(11)</div>
                      <div>[...]</div>
                      <div><br>
                      </div>
                      <div><br>
                      </div>
                      <div>Opensips 2.2.2. </div>
                      <div>I am also using rest_client - for each call,
                        before being proxied, an http request is made by
                        rest_client. Before and during this time the
                        http server was overloaded and took quite long
                        time. I am suspecting that this is linked to it
                        but would like to understand how exactly.</div>
                      <div><br>
                      </div>
                      <div>Thanks,</div>
                      <div>Dawid</div>
                      <div><br>
                      </div>
                    </div>
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