hi Vlad thanks you for reply   kamailio shared memory is already 512 (kamailio -m 512) but still same error getting  in logs  On Tue, Sep 3, 2019 at 6:44 PM Vlad Toma &lt;vldtoma(a)gmail.com <mailto:vldtoma@gmail.com>> wrote: Hello, You should try to increase the ram memory for kamailio when you start it ( kamailio -m 256) . I think your problem is similar to this one https://github.com/kamailio/kamailio/issues/1635  Regards, Vlad On Tue, Sep 3, 2019 at 3:46 PM Gaurav Bmotra &lt;saigauravmehra91(a)gmail.com <mailto:saigauravmehra91@gmail.com>> wrote: hi  i m using kamailio 5.1 on Ubuntu 18.04 i m geting this error in logs and it stop registration form soft-phone plz help me  -------------------------------------------------------------------------------------------------------- WARNING: tls [tls_init.c:778]: init_tls_h(): openssl bug #1491 (crash/mem leaks on low memory) workaround enabled (on low memory tls operations will fail preemptively) with free memory th -------------------------------------------------------------------------------------------------------- kamailio.service - LSB: Start the Kamailio SIP proxy server    Loaded: loaded (/etc/init.d/kamailio; generated)    Active: active (exited) since Tue 2019-09-03 12:09:19 UTC; 26min ago      Docs: man:systemd-sysv-generator(8)   Process: 27237 ExecStart=/etc/init.d/kamailio start (code=exited, status=0/SUCCESS) Sep 03 12:09:18 talk /usr/local/sbin/kamailio[27270]: INFO: <core> [core/cfg/cfg_ctx.c:595]: cfg_set_now(): tls.low_mem_threshold2 has been changed to 7077888 Sep 03 12:09:18 talk /usr/local/sbin/kamailio[27270]: INFO: <core> [main.c:2636]: main(): processes (at least): 27 - shm size: 536870912 - pkg size: 8388608 Sep 03 12:09:18 talk /usr/local/sbin/kamailio[27270]: ERROR: dispatcher [dispatcher.c:813]: ds_warn_fixup(): failover functions used, but required AVP parameters are NULL -- feature disabled Sep 03 12:09:18 talk /usr/local/sbin/kamailio[27270]: INFO: <core> [core/udp_server.c:153]: probe_max_receive_buffer(): SO_RCVBUF is initially 212992 Sep 03 12:09:18 talk /usr/local/sbin/kamailio[27270]: INFO: <core> [core/udp_server.c:205]: probe_max_receive_buffer(): SO_RCVBUF is finally 425984 Sep 03 12:09:18 talk /usr/local/sbin/kamailio[27270]: ERROR: <core> [core/tcp_main.c:2850]: tcp_init(): bind(c, 0x7f0b41b001f4, 16) on 172.31.35.49:5091 <http://172.31.35.49:5091> : Address already in use Sep 03 12:09:18 talk /usr/local/sbin/kamailio[27270]: INFO: <core> [core/sctp_core.c:53]: sctp_core_destroy(): SCTP API not initialized  -- thank you  *Regards:* Gaurav Kumar _______________________________________________ Kamailio (SER) - Users Mailing List sr-users(a)lists.kamailio.org <mailto:sr-users@lists.kamailio.org> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users _______________________________________________ Kamailio (SER) - Users Mailing List sr-users(a)lists.kamailio.org <mailto:sr-users@lists.kamailio.org> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users -- *Regards:* Gaurav Kumar _______________________________________________ Kamailio (SER) - Users Mailing List sr-users(a)lists.kamailio.org https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users