Hello David,

there were many fixes done regarding the TCP/TLS stack and a few regarding WebRTC in newer Kamailio releases.

I would recommend updating the Kamailio server to a supported version (5.8x., 6.0.x).

Other then that, I would probably setup some long-term network tracing trying to catch one of the occasional issues.

Cheers,

Henning

Henning Westerholt – https://skalatan.de/blog/

From: David Cunningham via sr-users <sr-users@lists.kamailio.org>
Sent: Donnerstag, 1. Mai 2025 00:12
To: Kamailio (SER) - Users Mailing List <sr-users@lists.kamailio.org>
Cc: David Cunningham <dcunningham@voisonics.com>
Subject: [SR-Users] WebRTC error NS_ERROR_NET_TIMEOUT

Hello,

Does anyone know of a reason (besides the obvious like network down) why users might experience a NS_ERROR_NET_TIMEOUT error in their browser when connecting to WebRTC port 8443 on Kamailio (version 5.2.7)? This only happens intermittently, so debugging it is tricky.

The number of connections to Kamailio port 8443 peaks at around 4150 daily. The max open files ulimit in Linux is 65535, and in the Kamailio configuration we have "tcp_max_connections=32768" and "tls_max_connections=32000".

Would anyone have any suggestions on where the problem might be?

Thanks in advance!

David Cunningham, Voisonics Limited
http://voisonics.com/
USA: +1 213 221 1092
New Zealand: +64 (0)28 2558 3782