It no longer looks like an issue related to set_reply_no_connect() or set_forward_no_connect() added by the commit you referenced. Those were added to prevent attempting to connect to devices behind the nat (in that case the device has to maintain the connection, otherwise nobody can connect back to it) as well as prevent someone in the wild sending a request then closing the connection, without waiting for the reply, which is typically routed back to via, commonly with an ephemeral port.
The follow up commit I did it in master recently is no longer setting the flag for requests within dialog, but I understand you have connection problems for requests within dialog, am I right?
Cheers, Daniel
On 10.09.19 01:08, Anthony Joseph Messina wrote:
I still ran into some trouble when one side was NAT'd.
Am I correct in thinking that it would be undesirable to maintain a TCP/TLS connection to an upstream TLS gateway that is using the well-known port 5061?
I was thinking this may be a case for TCP_REUSEPORT and force_send_socket, but that seems a little complex seeing as I can just let Kamailio reconnect (when necessary) rather than preventing the outbound TLS from connecting when it would otherwise succeed.
I'll try and work through more detailed configuration scenarios. -A
On Monday, September 9, 2019 2:12:07 AM CDT Daniel-Constantin Mierla wrote:
Hello,
I relaxed that condition to not connect on forwarding only for initial requests going though nat. Can you test with latest master and see how is going for your use case?
Cheers, Daniel
On 09.09.19 02:00, Anthony Joseph Messina wrote:
In preparation for the 5.3 release, I've been testing the following configuration change for TCP/TLS connections:
https://github.com/kamailio/kamailio/commit/ 8bba208fe6ae7ccb4c92362b8c33f1530b9f56da
route[REQINIT] {
# no connect for sending replies set_reply_no_connect(); if(has_totag()) { # no connect for requests within dialog set_forward_no_connect(); }This change creates issues when a UAC TLS INVITE routes to an upstream gateway using TLS to port 5061 (via the LCR module). Kamailio sends the initial outbound TLS connection from a local ephemeral port. The TCPOPS tcp_keepalive_enable function issues keepalives from the local ephemeral port to the gateway port 5061:
https://kamailio.org/docs/modules/stable/modules/ tcpops#tcpops.f.tcp_keepalive_enable
Even so, the TLS connection eventually times out, after which in-dialog requests from the UAC are no longer able to reach the upstream gateway.
ERROR: tm [../../core/forward.h:293]: msg_send_buffer(): tcp_send failed WARNING: tm [t_fwd.c:1570]: t_send_branch(): sending request on branch 0 failed ERROR: sl [sl_funcs.c:372]: sl_reply_error(): stateless error reply used: Unfortunately error on sending to next hop occurred (477/SL)
I figure I must be doing something wrong with my TCPOPS here. Is a TLS connection to an upstream gateway supposed to be maintained throughout the duration of a call?