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<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">As you suggested I increased the debug level from -1 to 3 and I got this Kamailio log:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Mar 4 15:40:21 server-xip-01 /usr/local/sbin/kamailio[29417]: DEBUG: <core> [io_wait.h:602]: io_watch_del(): DBG: io_watch_del
(0xa20dc0, 3433, -1, 0x0) fd_no=2922 called<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Mar 4 15:40:21 server-xip-01 /usr/local/sbin/kamailio[29417]: DEBUG: <core> [tcp_main.c:4139]: handle_tcpconn_ev(): sending
to child, events 1<o:p></o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Mar 4 15:40:21 server-xip-01 /usr/local/sbin/kamailio[29417]: DEBUG: <core> [tcp_main.c:3816]: send2child(): WARNING:
no free tcp receiver, connection passed to the least busy one (30)<o:p></o:p></span></b></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Mar 4 15:40:21 server-xip-01 /usr/local/sbin/kamailio[29417]: DEBUG: <core> [tcp_main.c:3821]: send2child(): selected
tcp worker 8 36(29409) for activity on [tls:X.X.X.X:5061], 0x7f482c2c2bc0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Mar 4 15:40:21 server-xip-01 /usr/local/sbin/kamailio[29409]: DEBUG: <core> [tcp_read.c:1576]: handle_io(): received
n=8 con=0x7f482c2c2bc0, fd=13<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Mar 4 15:40:21 server-xip-01 /usr/local/sbin/kamailio[29409]: DEBUG: tls [tls_server.c:197]: tls_complete_init(): completing
tls connection initialization<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Mar 4 15:40:21 server-xip-01 /usr/local/sbin/kamailio[29409]: DEBUG: tls [tls_server.c:226]: tls_complete_init(): Using
initial TLS domain TLSs<default> (dom 0x7f481b22ba50 ctx 0x7f481b6fbf20 sn [])<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Mar 4 15:40:21 server-xip-01 /usr/local/sbin/kamailio[29409]: DEBUG: tls [tls_domain.c:715]: sr_ssl_ctx_info_callback():
SSL handshake started<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Looking for this warning into the log, I realized that there are a lot of these messages:
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">sudo tail -f /var/log/kamailio.log | grep "no free tcp receiver"
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Mar 4 15:40:23 server-xip-01 /usr/local/sbin/kamailio[29417]: DEBUG: <core> [tcp_main.c:3816]: send2child(): WARNING:
no free tcp receiver, connection passed to the least busy one (20)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Mar 4 15:40:23 server-xip-01 /usr/local/sbin/kamailio[29417]: DEBUG: <core> [tcp_main.c:3816]: send2child(): WARNING:
no free tcp receiver, connection passed to the least busy one (20)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Mar 4 15:40:23 server-xip-01 /usr/local/sbin/kamailio[29417]: DEBUG: <core> [tcp_main.c:3816]: send2child(): WARNING:
no free tcp receiver, connection passed to the least busy one (21)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Mar 4 15:40:23 server-xip-01 /usr/local/sbin/kamailio[29417]: DEBUG: <core> [tcp_main.c:3816]: send2child(): WARNING:
no free tcp receiver, connection passed to the least busy one (20)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Mar 4 15:40:23 server-xip-01 /usr/local/sbin/kamailio[29417]: DEBUG: <core> [tcp_main.c:3816]: send2child(): WARNING:
no free tcp receiver, connection passed to the least busy one (21)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Mar 4 15:40:24 server-xip-01 /usr/local/sbin/kamailio[29417]: DEBUG: <core> [tcp_main.c:3816]: send2child(): WARNING:
no free tcp receiver, connection passed to the least busy one (14)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Mar 4 15:40:24 server-xip-01 /usr/local/sbin/kamailio[29417]: DEBUG: <core> [tcp_main.c:3816]: send2child(): WARNING:
no free tcp receiver, connection passed to the least busy one (15)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Mar 4 15:40:24 server-xip-01 /usr/local/sbin/kamailio[29417]: DEBUG: <core> [tcp_main.c:3816]: send2child(): WARNING:
no free tcp receiver, connection passed to the least busy one (16)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Mar 4 15:40:24 server-xip-01 /usr/local/sbin/kamailio[29417]: DEBUG: <core> [tcp_main.c:3816]: send2child(): WARNING:
no free tcp receiver, connection passed to the least busy one (16)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Mar 4 15:40:24 server-xip-01 /usr/local/sbin/kamailio[29417]: DEBUG: <core> [tcp_main.c:3816]: send2child(): WARNING:
no free tcp receiver, connection passed to the least busy one (16)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Mar 4 15:40:24 server-xip-01 /usr/local/sbin/kamailio[29417]: DEBUG: <core> [tcp_main.c:3816]: send2child(): WARNING:
no free tcp receiver, connection passed to the least busy one (17)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Mar 4 15:40:24 server-xip-01 /usr/local/sbin/kamailio[29417]: DEBUG: <core> [tcp_main.c:3816]: send2child(): WARNING:
no free tcp receiver, connection passed to the least busy one (17)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Mar 4 15:40:24 server-xip-01 /usr/local/sbin/kamailio[29417]: DEBUG: <core> [tcp_main.c:3816]: send2child(): WARNING:
no free tcp receiver, connection passed to the least busy one (17)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Mar 4 15:40:24 server-xip-01 /usr/local/sbin/kamailio[29417]: DEBUG: <core> [tcp_main.c:3816]: send2child(): WARNING:
no free tcp receiver, connection passed to the least busy one (16)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Mar 4 15:40:24 server-xip-01 /usr/local/sbin/kamailio[29417]: DEBUG: <core> [tcp_main.c:3816]: send2child(): WARNING:
no free tcp receiver, connection passed to the least busy one (17)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Mar 4 15:40:24 server-xip-01 /usr/local/sbin/kamailio[29417]: DEBUG: <core> [tcp_main.c:3816]: send2child(): WARNING:
no free tcp receiver, connection passed to the least busy one (18)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Mar 4 15:40:24 server-xip-01 /usr/local/sbin/kamailio[29417]: DEBUG: <core> [tcp_main.c:3816]: send2child(): WARNING:
no free tcp receiver, connection passed to the least busy one (18)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Mar 4 15:40:24 server-xip-01 /usr/local/sbin/kamailio[29417]: DEBUG: <core> [tcp_main.c:3816]: send2child(): WARNING:
no free tcp receiver, connection passed to the least busy one (18)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Mar 4 15:40:24 server-xip-01 /usr/local/sbin/kamailio[29417]: DEBUG: <core> [tcp_main.c:3816]: send2child(): WARNING:
no free tcp receiver, connection passed to the least busy one (18)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Mar 4 15:40:24 server-xip-01 /usr/local/sbin/kamailio[29417]: DEBUG: <core> [tcp_main.c:3816]: send2child(): WARNING:
no free tcp receiver, connection passed to the least busy one (18)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Mar 4 15:40:24 server-xip-01 /usr/local/sbin/kamailio[29417]: DEBUG: <core> [tcp_main.c:3816]: send2child(): WARNING:
no free tcp receiver, connection passed to the least busy one (18)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">…..<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">….<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">As far as I know, I should increase the tcp_children parameter, right?.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Now, it’s set to 16 but it’s pretty clear which is not enough. I increased it step by step till 48 but that’s still not
enough. <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">If I set it to 64 then Kamailio failed to start.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">What would you recommend for a server which has more or less 5K users?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Many thanks.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">T.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p style="FONT-FAMILY: arial; FONT-SIZE: 10pt"><span style="FONT-SIZE: 10pt; -webkit-text-adjust: none" id="c1-id-7"><strong style="FONT-SIZE: 10pt" id="c1-id-8">Tomas Zanet</strong><br style="FONT-SIZE: 10pt" id="c1-id-9">
R&D Software Designer<br style="FONT-SIZE: 10pt" id="c1-id-10">
tzanet@came.com<br>
</span><br id="c1-id-12">
<a id="c1-id-14" title="CAME" href="http://www.came.com" name="c1-id-14"></a><img border="0" src="cid:LogoNew_f0706ef0-76e6-499c-97ed-10496392d3f5.png"><br>
<br id="c1-id-16">
<span style="FONT-SIZE: 8pt" id="c1-id-17"><strong id="c1-id-18"><span style="FONT-SIZE: 10pt">CAME S.p.A.</span></strong><br style="FONT-SIZE: 10pt">
<span style="FONT-SIZE: 10pt"><strong>Sede legale e operativa</strong><br>
</span></span><span style="FONT-SIZE: 10pt">Via Martiri della Libertà 15<br style="FONT-SIZE: 10pt">
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<strong><font color="#02b2ee">P.IVA</font></strong> 03481280265<br>
Cod. dest. fatturazione elettronica: UHWULCH</span><span style="FONT-SIZE: 10pt"><br>
</span></p>
<p style="FONT-FAMILY: arial; FONT-SIZE: 10pt"><span style="FONT-SIZE: 8pt" id="c1-id-24"><span style="FONT-SIZE: 10pt"><strong>Sede operativa</strong></span><br style="FONT-SIZE: 10pt">
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<p class="MsoNormal"><b><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif">Da:</span></b><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> sr-users [mailto:sr-users-bounces@lists.kamailio.org]
<b>Per conto di </b>Denys Pozniak<br>
<b>Inviato:</b> mercoledì 4 marzo 2020 15:00<br>
<b>A:</b> Kamailio (SER) - Users Mailing List <sr-users@lists.kamailio.org><br>
<b>Oggetto:</b> Re: [SR-Users] Kamailio connection issue<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><span lang="EN-GB">Hello!<o:p></o:p></span></p>
<div>
<p class="MsoNormal"><span lang="EN-GB">You can try to increase the debug printing level (like debug=2 or even debug=3) and check syslog when Kamailio gets stuck.<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
</div>
</div>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<div>
<div>
<p class="MsoNormal">ср<span lang="EN-GB">, 4 </span>мар<span lang="EN-GB">. 2020
</span>г<span lang="EN-GB">. </span>в<span lang="EN-GB"> 13:12, Tomas Zanet <</span><a href="mailto:tzanet@came.com"><span lang="EN-GB">tzanet@came.com</span></a><span lang="EN-GB">>:<o:p></o:p></span></p>
</div>
<blockquote style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0cm;margin-bottom:5.0pt">
<p class="MsoNormal"><span lang="EN-GB">Hi All,<br>
<br>
In these days I'm facing an issue or a misconfiguration, I don't know, with our remote apps (SIP clients) and our cloud server in which there's a Kamailio version 4.4.4.<br>
Sometimes our app takes some seconds (about 10-12sec) to connect to the Kamailio socket (sips on 5061) and our app is stuck on connect sytem call.<br>
<br>
To debug this behaviour I put a rule in the iptable like this:<br>
sudo iptables -I INPUT -p tcp -m tcp --dport 5061 -m state --state NEW -j LOG --log-level 1 --log-prefix "New Connection "<br>
<br>
when everything goes well, there is one row which describes the new incoming connection Mar 4 07:08:40 server-xip-01 kernel: New Connection IN=eth0 OUT= MAC=bc:76:4e:20:1f:fb:e8:ed:f3:3a:52:41:08:00 SRC=X.X.X.X DST=Y.Y.Y.Y LEN=64 TOS=0x00 PREC=0x00 TTL=45
ID=0 DF PROTO=TCP SPT=15819 DPT=5061 WINDOW=65535 RES=0x00 CWR ECE SYN URGP=0<br>
<br>
when our app gets stuck in the connect, there are many attempts and seems that Kamailio is not ready to accept this connection:<br>
Mar 4 07:11:54 server-xip-01 kernel: New Connection IN=eth0 OUT= MAC=bc:76:4e:20:1f:fb:e8:ed:f3:3a:52:41:08:00 SRC=X.X.X.X DST=Y.Y.Y.Y LEN=64 TOS=0x00 PREC=0x00 TTL=45 ID=0 DF PROTO=TCP SPT=52900 DPT=5061 WINDOW=65535 RES=0x00 CWR ECE SYN URGP=0 Mar 4 07:11:54
server-xip-01 kernel: New Connection IN=eth0 OUT= MAC=bc:76:4e:20:1f:fb:e8:ed:f3:3a:52:41:08:00 SRC=X.X.X.X DST=Y.Y.Y.Y LEN=64 TOS=0x00 PREC=0x00 TTL=45 ID=0 DF PROTO=TCP SPT=52900 DPT=5061 WINDOW=65535 RES=0x00 SYN URGP=0 Mar 4 07:11:55 server-xip-01 kernel:
New Connection IN=eth0 OUT= MAC=bc:76:4e:20:1f:fb:e8:ed:f3:3a:52:41:08:00 SRC=X.X.X.X DST=Y.Y.Y.Y LEN=64 TOS=0x00 PREC=0x00 TTL=45 ID=0 DF PROTO=TCP SPT=52900 DPT=5061 WINDOW=65535 RES=0x00 SYN URGP=0 Mar 4 07:11:55 server-xip-01 kernel: New Connection IN=eth0
OUT= MAC=bc:76:4e:20:1f:fb:e8:ed:f3:3a:52:41:08:00 SRC=X.X.X.X DST=Y.Y.Y.Y LEN=64 TOS=0x00 PREC=0x00 TTL=45 ID=0 DF PROTO=TCP SPT=52900 DPT=5061 WINDOW=65535 RES=0x00 SYN URGP=0 Mar 4 07:11:55 server-xip-01 kernel: New Connection IN=eth0 OUT= MAC=bc:76:4e:20:1f:fb:e8:ed:f3:3a:52:41:08:00
SRC=X.X.X.X DST=Y.Y.Y.Y LEN=64 TOS=0x00 PREC=0x00 TTL=45 ID=0 DF PROTO=TCP SPT=52900 DPT=5061 WINDOW=65535 RES=0x00 SYN URGP=0 Mar 4 07:11:56 server-xip-01 kernel: New Connection IN=eth0 OUT= MAC=bc:76:4e:20:1f:fb:e8:ed:f3:3a:52:41:08:00 SRC=X.X.X.X DST=Y.Y.Y.Y
LEN=64 TOS=0x00 PREC=0x00 TTL=45 ID=0 DF PROTO=TCP SPT=52900 DPT=5061 WINDOW=65535 RES=0x00 SYN URGP=0 Mar 4 07:11:56 server-xip-01 kernel: New Connection IN=eth0 OUT= MAC=bc:76:4e:20:1f:fb:e8:ed:f3:3a:52:41:08:00 SRC=X.X.X.X DST=Y.Y.Y.Y LEN=64 TOS=0x00 PREC=0x00
TTL=45 ID=0 DF PROTO=TCP SPT=52900 DPT=5061 WINDOW=65535 RES=0x00 SYN URGP=0 Mar 4 07:11:56 server-xip-01 kernel: New Connection IN=eth0 OUT= MAC=bc:76:4e:20:1f:fb:e8:ed:f3:3a:52:41:08:00 SRC=X.X.X.X DST=Y.Y.Y.Y LEN=64 TOS=0x00 PREC=0x00 TTL=45 ID=0 DF PROTO=TCP
SPT=52900 DPT=5061 WINDOW=65535 RES=0x00 SYN URGP=0 Mar 4 07:11:58 server-xip-01 kernel: New Connection IN=eth0 OUT= MAC=bc:76:4e:20:1f:fb:e8:ed:f3:3a:52:41:08:00 SRC=X.X.X.X DST=Y.Y.Y.Y LEN=64 TOS=0x00 PREC=0x00 TTL=45 ID=0 DF PROTO=TCP SPT=52900 DPT=5061
WINDOW=65535 RES=0x00 SYN URGP=0 Mar 4 07:12:00 server-xip-01 kernel: New Connection IN=eth0 OUT= MAC=bc:76:4e:20:1f:fb:e8:ed:f3:3a:52:41:08:00 SRC=X.X.X.X DST=Y.Y.Y.Y LEN=64 TOS=0x00 PREC=0x00 TTL=45 ID=0 DF PROTO=TCP SPT=52900 DPT=5061 WINDOW=65535 RES=0x00
SYN URGP=0 Mar 4 07:12:05 server-xip-01 kernel: New Connection IN=eth0 OUT= MAC=bc:76:4e:20:1f:fb:e8:ed:f3:3a:52:41:08:00 SRC=X.X.X.X DST=Y.Y.Y.Y LEN=48 TOS=0x00 PREC=0x00 TTL=45 ID=0 DF PROTO=TCP SPT=52900 DPT=5061 WINDOW=65535 RES=0x00 SYN URGP=0 When it
happens our app takes more than 10 sec to connect to the Kamailio socket.<br>
<br>
I tried to increase the children configuration parameter in the cfg file because I thought there were not enough tcp receiver but with no luck.<br>
Here are some configuration parameters:<br>
<br>
children = 16 // was 8 before found this issue<br>
<br>
# life time of TCP connection when there is no traffic # - a bit higher than registration expires to cope with UA behind NAT<br>
tcp_connection_lifetime=3605<br>
<br>
open_files_limit=8192<br>
<br>
tcp_max_connections=8192<br>
tls_max_connections=8192<br>
<br>
Here is the output of the ulimit command:<br>
ulimit -a<br>
core file size (blocks, -c) 0<br>
data seg size (kbytes, -d) unlimited<br>
scheduling priority (-e) 0<br>
file size (blocks, -f) unlimited<br>
pending signals (-i) 31393<br>
max locked memory (kbytes, -l) 64<br>
max memory size (kbytes, -m) unlimited<br>
open files (-n) 65535<br>
pipe size (512 bytes, -p) 8<br>
POSIX message queues (bytes, -q) 819200<br>
real-time priority (-r) 0<br>
stack size (kbytes, -s) 8192<br>
cpu time (seconds, -t) unlimited<br>
max user processes (-u) 31393<br>
virtual memory (kbytes, -v) unlimited<br>
file locks (-x) unlimited<br>
In the kamailio log file I don't see anything wrong, I don't see messages like "[tcp_main.c:3913]: handle_new_connect(): maximum number of tls connections exceeded".<br>
<br>
Here is the output of kamctl ps command<br>
Process:: ID=0 PID=11725 Type=main process - attendant<br>
Process:: ID=1 PID=11727 Type=udp receiver child=0 sock=</span><a href="http://10.208.194.26:5061" target="_blank"><span lang="EN-GB">10.208.194.26:5061</span></a><span lang="EN-GB"><br>
Process:: ID=2 PID=11728 Type=udp receiver child=1 sock=</span><a href="http://10.208.194.26:5061" target="_blank"><span lang="EN-GB">10.208.194.26:5061</span></a><span lang="EN-GB"><br>
Process:: ID=3 PID=11729 Type=udp receiver child=2 sock=</span><a href="http://10.208.194.26:5061" target="_blank"><span lang="EN-GB">10.208.194.26:5061</span></a><span lang="EN-GB"><br>
Process:: ID=4 PID=11730 Type=udp receiver child=3 sock=</span><a href="http://10.208.194.26:5061" target="_blank"><span lang="EN-GB">10.208.194.26:5061</span></a><span lang="EN-GB"><br>
Process:: ID=5 PID=11731 Type=udp receiver child=4 sock=</span><a href="http://10.208.194.26:5061" target="_blank"><span lang="EN-GB">10.208.194.26:5061</span></a><span lang="EN-GB"><br>
Process:: ID=6 PID=11732 Type=udp receiver child=5 sock=</span><a href="http://10.208.194.26:5061" target="_blank"><span lang="EN-GB">10.208.194.26:5061</span></a><span lang="EN-GB"><br>
Process:: ID=7 PID=11733 Type=udp receiver child=6 sock=</span><a href="http://10.208.194.26:5061" target="_blank"><span lang="EN-GB">10.208.194.26:5061</span></a><span lang="EN-GB"><br>
Process:: ID=8 PID=11734 Type=udp receiver child=7 sock=</span><a href="http://10.208.194.26:5061" target="_blank"><span lang="EN-GB">10.208.194.26:5061</span></a><span lang="EN-GB"><br>
Process:: ID=9 PID=11735 Type=udp receiver child=8 sock=</span><a href="http://10.208.194.26:5061" target="_blank"><span lang="EN-GB">10.208.194.26:5061</span></a><span lang="EN-GB"><br>
Process:: ID=10 PID=11736 Type=udp receiver child=9 sock=</span><a href="http://10.208.194.26:5061" target="_blank"><span lang="EN-GB">10.208.194.26:5061</span></a><span lang="EN-GB"><br>
Process:: ID=11 PID=11737 Type=udp receiver child=10 sock=</span><a href="http://10.208.194.26:5061" target="_blank"><span lang="EN-GB">10.208.194.26:5061</span></a><span lang="EN-GB"><br>
Process:: ID=12 PID=11738 Type=udp receiver child=11 sock=</span><a href="http://10.208.194.26:5061" target="_blank"><span lang="EN-GB">10.208.194.26:5061</span></a><span lang="EN-GB"><br>
Process:: ID=13 PID=11739 Type=udp receiver child=12 sock=</span><a href="http://10.208.194.26:5061" target="_blank"><span lang="EN-GB">10.208.194.26:5061</span></a><span lang="EN-GB"><br>
Process:: ID=14 PID=11740 Type=udp receiver child=13 sock=</span><a href="http://10.208.194.26:5061" target="_blank"><span lang="EN-GB">10.208.194.26:5061</span></a><span lang="EN-GB"><br>
Process:: ID=15 PID=11741 Type=udp receiver child=14 sock=</span><a href="http://10.208.194.26:5061" target="_blank"><span lang="EN-GB">10.208.194.26:5061</span></a><span lang="EN-GB"><br>
Process:: ID=16 PID=11742 Type=udp receiver child=15 sock=</span><a href="http://10.208.194.26:5061" target="_blank"><span lang="EN-GB">10.208.194.26:5061</span></a><span lang="EN-GB"><br>
Process:: ID=17 PID=11743 Type=slow timer<br>
Process:: ID=18 PID=11744 Type=timer<br>
Process:: ID=19 PID=11745 Type=secondary timer<br>
Process:: ID=20 PID=11746 Type=MI FIFO<br>
Process:: ID=21 PID=11747 Type=USRLOC Timer<br>
Process:: ID=22 PID=11748 Type=USRLOC Timer<br>
Process:: ID=23 PID=11749 Type=USRLOC Timer<br>
Process:: ID=24 PID=11750 Type=USRLOC Timer<br>
Process:: ID=25 PID=11751 Type=ctl handler<br>
Process:: ID=26 PID=11752 Type=RTIMER SEC EXEC<br>
Process:: ID=27 PID=11753 Type=TIMER NH<br>
Process:: ID=28 PID=11754 Type=tcp receiver (generic) child=0<br>
Process:: ID=29 PID=11755 Type=tcp receiver (generic) child=1<br>
Process:: ID=30 PID=11756 Type=tcp receiver (generic) child=2<br>
Process:: ID=31 PID=11757 Type=tcp receiver (generic) child=3<br>
Process:: ID=32 PID=11758 Type=tcp receiver (generic) child=4<br>
Process:: ID=33 PID=11759 Type=tcp receiver (generic) child=5<br>
Process:: ID=34 PID=11760 Type=tcp receiver (generic) child=6<br>
Process:: ID=35 PID=11761 Type=tcp receiver (generic) child=7<br>
Process:: ID=36 PID=11762 Type=tcp receiver (generic) child=8<br>
Process:: ID=37 PID=11763 Type=tcp receiver (generic) child=9<br>
Process:: ID=38 PID=11764 Type=tcp receiver (generic) child=10<br>
Process:: ID=39 PID=11765 Type=tcp receiver (generic) child=11<br>
Process:: ID=40 PID=11766 Type=tcp receiver (generic) child=12<br>
Process:: ID=41 PID=11767 Type=tcp receiver (generic) child=13<br>
Process:: ID=42 PID=11768 Type=tcp receiver (generic) child=14<br>
Process:: ID=43 PID=11769 Type=tcp receiver (generic) child=15<br>
Process:: ID=44 PID=11770 Type=tcp main process<br>
<br>
<br>
Can anyone address me to find out this happens, please?<br>
Please let me know if you need further information...<br>
<br>
Thanks in advance,<br>
Best Regards<br>
Tomas<br>
<br>
<br>
<br>
Tomas Zanet<br>
R&D Software Designer<br>
</span><a href="mailto:tzanet@came.com" target="_blank"><span lang="EN-GB">tzanet@came.com</span></a><span lang="EN-GB"><br>
CAME S.p.A.<br>
<br>
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<p class="MsoNormal"><span lang="EN-GB"><br clear="all">
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<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
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<p class="MsoNormal">-- <o:p></o:p></p>
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<p class="MsoNormal">BR,<o:p></o:p></p>
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<p class="MsoNormal">Denys Pozniak<o:p></o:p></p>
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