Hi<br><br>Using Kamailio 1.5 we periodically get the following errors:<br><br>Jul  1 09:54:41 localhost /usr/local/sbin/openser[3836]: ERROR:core:tcp_blocking_connect: poll error: flags 18<br>Jul  1 09:54:41 localhost /usr/local/sbin/openser[3836]: ERROR:core:tcp_blocking_connect: failed to retrieve SO_ERROR (110) Connection timed out<br>

Jul  1 09:54:41 localhost /usr/local/sbin/openser[3836]: ERROR:core:tcpconn_connect: tcp_blocking_connect failed<br>Jul  1 09:54:41 localhost /usr/local/sbin/openser[3836]: ERROR:core:tcp_send: connect failed<br>Jul  1 09:54:41 localhost /usr/local/sbin/openser[3836]: ERROR:tm:msg_send: tcp_send failed<br>

<br>They are several emails in this mailing list explaining we should play with tcp parameters. I will try to change my configuration and see if we can solve this issue.<br><br>But when this kind of error happen we observe that the kamailio processes are using 100% of CPU (top).<br>

<br>Our client is using SIP over TCP only (no UDP).<br><br>Do you have any hint on how to configure Kamailio to improve TCP support ? Is it normal to kamailio processes to overload CPU ?<br><br>Regards,<br>Pascal<br>