Hello Christoph, just giving some general advice - can you get a backtrace on the core dump: https://www.kamailio.org/wiki/tutorials/troubleshooting/coredumpfile Are there some error messages in the log as well before the crash happened? Cheers, Henning -- Henning Westerholt - https://skalatan.de/blog/ Kamailio services - https://skalatan.de/services From: sr-users <sr-users-bounces(a)lists.kamailio.org> On Behalf Of Valentin Christoph Sent: Wednesday, September 25, 2019 5:07 PM To: Kamailio (SER) - Users Mailing List <sr-users(a)lists.kamailio.org> Cc: Onic Roman <Roman.Onic(a)kontron.com>om>; Friedrich Peter <Peter.Friedrich(a)kontron.com> Subject: [SR-Users] ims_ipsec_pcscf: maybe core dump due to maximum count of connections Hi, Doing some tests with the module ims_ipsec_pcscf, we encountered a core dump during startup of Kamailio and would like to understand the correct behavior. We assume the ipsec_max_connections parameter was the root cause --> how many max connections have been actually tested? Can it be that ipsec_client-port and ipsec_server_port were too close together (some overlapping)? Thx Christoph