Just as a matter of passing interest: This problem appears to have reared its head again with Kamailio 4.2: http://sip-router.org/tracker/index.php?do=details&task_id=178 In my case, it is only under CentOS 7, with Kamailio running using LSB init scripts adapted through systemd. I have not seen it in any other scenario, with identical config. May 03 16:15:14 proxy /usr/local/sbin/kamailio[8508]: ERROR: db_postgres [km_pg_con.c:86]: db_postgres_new_connection(): connection pointer is NULL May 03 16:15:14 proxy /usr/local/sbin/kamailio[8508]: ERROR: db_postgres [km_pg_con.c:99]: db_postgres_new_connection(): cleaning up 0x7fef39cc9068=pkg_free() May 03 16:15:14 proxy /usr/local/sbin/kamailio[8508]: ERROR: <core> [db.c:322]: db_do_init2(): could not add connection to the pool May 03 16:15:14 csrp1 /usr/local/sbin/kamailio[8508]: ERROR: usrloc [ul_mod.c:429]: child_init(): child(0): failed to connect to database May 03 16:15:14 proxy /usr/local/sbin/kamailio[8508]: ERROR: <core> [sr_module.c:923]: init_mod_child(): Error while initializing module usrloc (/usr/local/lib64/kamaili May 03 16:15:14 proxy /usr/local/sbin/kamailio[8508]: ERROR: <core> [main.c:1707]: main_loop(): error in init_child This problem does not present when running with fork=no, and is indeed due to my loading 'usrloc' before 'db_postgres'. Swapping the loading order fixed the problem. -- Alex Balashov | Principal | Evariste Systems LLC 303 Perimeter Center North, Suite 300 Atlanta, GA 30346 United States Tel: +1-800-250-5920 (toll-free) / +1-678-954-0671 (direct) Web: http://www.evaristesys.com/, http://www.csrpswitch.com/