[sr-dev] [kamailio/kamailio] Kamailio was not accepting TLS connections (#2796)

we are getting the following errors in Kamailio logs **kamailio.log** Jun 29 08:08:14 fep-1 /usr/local/fep-kamailio/sbin/kamailio[14111]: ERROR: <core> [core/tcp_main.c:4451]: handle_tcpconn_ev(): io_watch_del(3) failed: for 0x7f524f7862d0, fd 30406 Jun 29 08:08:14 fep-1 /usr/local/fep-kamailio/sbin/kamailio[14111]: ERROR: <core> [core/tcp_main.c:4451]: handle_tcpconn_ev(): io_watch_del(3) failed: for 0x7f525a6c5f90, fd 30407 Jun 29 08:08:14 fep-1 /usr/local/fep-kamailio/sbin/kamailio[14111]: ERROR: <core> [core/tcp_main.c:4451]: handle_tcpconn_ev(): io_watch_del(3) failed: for 0x7f52449e0978, fd 30415 Jun 29 08:06:27 fep-1 /usr/local/fep-kamailio/sbin/kamailio[14111]: CRITICAL: <core> [core/io_wait.h:596]: io_watch_del(): invalid fd 30355, not in [0, 4607) Jun 29 08:06:27 fep-1 /usr/local/fep-kamailio/sbin/kamailio[14111]: CRITICAL: <core> [core/io_wait.h:596]: io_watch_del(): invalid fd 30356, not in [0, 4607) Jun 29 08:06:27 fep-1 /usr/local/fep-kamailio/sbin/kamailio[14111]: CRITICAL: <core> [core/io_wait.h:596]: io_watch_del(): invalid fd 30358, not in [0, 4607) **Description** On checking this issue we found that Kamailio was not accepting TLS connections. We were getting an error which is mentioned above. We double-checked TLS and TCP connections and they were normal. We have 5000+ TLS connections and the max connection limit is 30,000. So we were not exceeding the TLS connection limit. We also verified open_files_limits. It is around 1 million which is more than enough. **Kamailio Version** - output of kamailio -v version: kamailio 5.4.2 (x86_64/linux) f8885c flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB poll method support: poll, epoll_lt, epoll_et, sigio_rt, select. id: f8885c **Operating System:** NAME="CentOS Linux" VERSION="7 (Core)" ID="centos" ID_LIKE="rhel fedora" VERSION_ID="7" PRETTY_NAME="CentOS Linux 7 (Core)" ANSI_COLOR="0;31" CPE_NAME="cpe:/o:centos:centos:7" HOME_URL="https://www.centos.org/" BUG_REPORT_URL="https://bugs.centos.org/" CENTOS_MANTISBT_PROJECT="CentOS-7" CENTOS_MANTISBT_PROJECT_VERSION="7" REDHAT_SUPPORT_PRODUCT="centos" REDHAT_SUPPORT_PRODUCT_VERSION="7" -- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: https://github.com/kamailio/kamailio/issues/2796