Hello all

we are seeing these kind of logs in a Debian GNU/Linux 11 using kamailio 5.5.6

```Sep 21 17:41:13 lax-dedge-1 /usr/local/kamailio/sbin/kamailio[3155702]: ERROR: <core> [core/forward.c:183]: get_out_socket(): no corresponding socket found for(udp:[164.152.22.248:5060](http://164.152.22.248:5060/)) Sep 21 17:41:13 lax-dedge-1 /usr/local/kamailio/sbin/kamailio[3155698]: ERROR: <core> [core/forward.c:183]: get_out_socket(): no corresponding socket found for(udp:[208.74.138.184:5060](http://208.74.138.184:5060/)) Sep 21 17:41:13 lax-dedge-1 /usr/local/kamailio/sbin/kamailio[3155695]: ERROR: <core> [core/forward.c:183]: get_out_socket(): no corresponding socket found for(udp:[208.74.138.181:5060](http://208.74.138.181:5060/)) Sep 21 17:41:14 lax-dedge-1 /usr/local/kamailio/sbin/kamailio[3155693]: ERROR: <core> [core/forward.c:183]: get_out_socket(): no corresponding socket found for(udp:[38.102.250.60:5060](http://38.102.250.60:5060/)) Sep 21 17:41:14 lax-dedge-1 /usr/local/kamailio/sbin/kamailio[3155707]: ERROR: <core> [core/forward.c:183]: get_out_socket(): no corresponding socket found for(udp:[87.1.1.27:5060](http://87.1.1.27:5060/)) Sep 21 17:41:14 lax-dedge-1 /usr/local/kamailio/sbin/kamailio[3155707]: ERROR: tm [ut.h:302]: uri2dst2(): no corresponding socket for "87.1.1.27" af 2 Sep 21 17:41:14 lax-dedge-1 /usr/local/kamailio/sbin/kamailio[3155707]: ERROR: tm [t_fwd.c:470]: prepare_new_uac(): can't fwd to af 2, proto 1 (no corresponding listening socket) Sep 21 17:41:14 lax-dedge-1 /usr/local/kamailio/sbin/kamailio[3155697]: ERROR: <core> [core/forward.c:183]: get_out_socket(): no corresponding socket found for(udp:[208.74.138.184:5060](http://208.74.138.184:5060/)) Sep 21 17:41:14 lax-dedge-1 /usr/local/kamailio/sbin/kamailio[3155694]: ERROR: <core> [core/forward.c:183]: get_out_socket(): no corresponding socket found for(udp:[192.40.216.97:5060](http://192.40.216.97:5060/)) Sep 21 17:41:14 lax-dedge-1 /usr/local/kamailio/sbin/kamailio[3155694]: ERROR: <core> [core/forward.c:183]: get_out_socket(): no corresponding socket found for(udp:[208.74.138.180:5060](http://208.74.138.180:5060/)) Sep 21 17:41:14 lax-dedge-1 /usr/local/kamailio/sbin/kamailio[3155714]: ERROR: <core> [core/forward.c:183]: get_out_socket(): no corresponding socket found for(udp:[87.1.1.27:5060](http://87.1.1.27:5060/)) ```

The kamailio instance we are using is receiving around 1500 calls per second in average when we do start seeing these errors more frequently In this instance we are using multihomed the listen address list is

``` children=14 socket_workers=1 listen=udp:[192.168.99.70:5081](http://192.168.99.70:5081/) listen=udp:[192.168.99.81:5060](http://192.168.99.81:5060/) listen=udp:[87.1.1.27:5060](http://87.1.1.27:5060/) listen=tcp:[192.168.96.105:8095](http://192.168.96.105:8095/) listen=tcp:[87.1.1.27:5060](http://87.1.1.27:5060/) tcp_children=6 port=5060 ```

We use the first worker only to perform the OPTIONS requests from the dispatcher module. The sockets listen=udp:[192.168.99.81:5060](http://192.168.99.81:5060/) listen=udp:[87.1.1.27:5060](http://87.1.1.27:5060/) are used to communicate both A and B legs

so when a message is received at [192.168.99.81:5060](http://192.168.99.81:5060/) we send it to [87.1.1.27:5060](http://87.1.1.27:5060/) and viceversa We were using $fs variable before doing the t_relay() function. This way is working, but when load increases, seems sometimes kamailio doesn't get the proper socket to forward the reply. I think the errors mainly are related to responses which are being forwarded, like if the function get_sock_info_list was not able to retrieve the listen interfaces

we have tried to set in the onreply routes the commands set_recv_socket("udp:[192.168.99.81:5060](http://192.168.99.81:5060/)"); set_send_socket("udp:[87.1.1.27:5060](http://87.1.1.27:5060/)"); (when reply goes from private to public domain)

and it seems it reduces the number of ``` Sep 21 17:41:13 lax-dedge-1 /usr/local/kamailio/sbin/kamailio[3155702]: ERROR: <core> [core/forward.c:183]: get_out_socket(): no corresponding socket found for(udp:[164.152.22.248:5060](http://164.152.22.248:5060/)) Sep 21 17:41:13 lax-dedge-1 /usr/local/kamailio/sbin/kamailio[3155698]: ERROR: <core> [core/forward.c:183]: get_out_socket(): no corresponding socket found for(udp:[208.74.138.184:5060](http://208.74.138.184:5060/)) Sep 21 17:41:13 lax-dedge-1 /usr/local/kamailio/sbin/kamailio[3155695]: ERROR: <core> [core/forward.c:183]: get_out_socket(): no corresponding socket found for(udp:[208.74.138.181:5060](http://208.74.138.181:5060/)) Sep 21 17:41:14 lax-dedge-1 /usr/local/kamailio/sbin/kamailio[3155693]: ERROR: <core> [core/forward.c:183]: get_out_socket(): no corresponding socket found for(udp:[38.102.250.60:5060](http://38.102.250.60:5060/)) errors ```

But i honestly don't know why the ```Sep 21 17:41:14 lax-dedge-1 /usr/local/kamailio/sbin/kamailio[3155707]: ERROR: tm [ut.h:302]: uri2dst2(): no corresponding socket for "87.1.1.27" af 2 Sep 21 17:41:14 lax-dedge-1 /usr/local/kamailio/sbin/kamailio[3155707]: ERROR: tm [t_fwd.c:470]: prepare_new_uac(): can't fwd to af 2, proto 1 (no corresponding listening socket) appear ```

We also tried to increase the kernel buffers rmem and wmem from 208KB (as we had by default) to 4MB

Do you know a reason which could cause these logs to appear? Any setup that could mitigate them?

thanks a lot and regards david escartin