New subject: Unable to establish TCP connection with Kamailio

17 Jun 2021

      Hello Ovidiu,
Interestingly, that fixed the problem. I can now continue to make progress.
Why does not forking and/or logging to stderr cause this to happen?
Thank you!
Regards,
Peter Manley
Ovidiu Sas osas at voipembedded.commailto:sr-users%40lists.kamailio.org?Subject=Re%3A%20%5BSR-Users%5D%20Unable%20to%20establish%20TCP%20connection%20with%20Kamailio&In-Reply-To=%3CCAND0LkvxyxE%3D5CPxZTe-Em43X6E5nep6z9n7a8f1zo3YbKksMw%40mail.gmail.com%3E
Thu Jun 17 23:05:14 CEST 2021
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It seems that you have fork set to no,
Let kamailio fork and collect logs via syslog (not via stderror).
-ovidiu
On Thu, Jun 17, 2021 at 16:26 Peter Manley <peter.manley at kombea.comhttps://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users> wrote:
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Hello,
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I'm running Kamailio Version 5.3.2 on Ubuntu 20.04. Here my build
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information:
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version: kamailio 5.3.2 (x86_64/linux)
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flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS,
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DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, Q_MALLOC,
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F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT,
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USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLACKLIST,
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HAVE_RESOLV_RES, TLS_PTHREAD_MUTEX_SHARED
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ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_URI_SIZE 1024,
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BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
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poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
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id: unknown
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compiled with gcc 9.2.1
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I have the following configuration set in my kamalio.cfg file:
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##!define WITH_MYSQL
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##!define WITH_AUTH
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##!define WITH_USRLOCDB
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##!define WITH_TLS
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##!define WITH_HOMER
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##!define WITH_WEBSOCKETS
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##!define WITH_ANTIFLOOD
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##!define WITH_IPV6
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##!define WITH_BRIDGE_ON_FAIL
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##!define WITH_LOCALHOST_WS
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##!define WITH_LOCALHOST_SIP
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#!substdef "!MY_SIP_PORT!5060!g"
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#!substdef "!MY_SIPS_PORT!5061!g"
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#!substdef "!MY_WS_PORT!8088!g"
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#!substdef "!MY_WSS_PORT!8089!g"
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#!substdef "!MY_LOG_FACILITY!LOG_DAEMON!g"
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#!substdef "!MY_IP4_ADDR!172.16.0.57!g"
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#!substdef "!IP4_LOCALHOST!127.0.0.1!g"
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#!substdef "!MY_WS4_ADDR!tcp:MY_IP4_ADDR:MY_WS_PORT!g"
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#!substdef "!MY_WSS4_ADDR!tls:MY_IP4_ADDR:MY_WSS_PORT!g"
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#!substdef "!LOCALHOST_WS4_ADDR!tcp:IP4_LOCALHOST:MY_WS_PORT!g"
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#!substdef "!LOCALHOST_WSS4_ADDR!tls:IP4_LOCALHOST:MY_WSS_PORT!g"
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#!ifdef WITH_IPV6
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#!substdef "!MY_IP6_ADDR![fe80::d6e4:2f5f:e5b7:7dff]!g"
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#!substdef "!IP6_LOCALHOST![::1]!g"
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#!substdef "!MY_WS6_ADDR!tcp:MY_IP6_ADDR:MY_WS_PORT!g"
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#!substdef "!MY_WSS6_ADDR!tls:MY_IP6_ADDR:MY_WSS_PORT!g"
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#!substdef "!LOCALHOST_WS6_ADDR!tcp:IP6_LOCALHOST:MY_WS_PORT!g"
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#!substdef "!LOCALHOST_WSS6_ADDR!tls:IP6_LOCALHOST:MY_WSS_PORT!g"
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#!endif
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#!substdef "!MY_DOMAIN!rtpengine.kombea.io!g"
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debug=10         // debug level (cmd line: -dddddddddd)
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children=4
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#fork=yes
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force_rport=yes // Add recieved port to VIA
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#log_stderror=no        // (cmd line: -E)
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// Uncomment these lines to enter debugging mode
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fork=no
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log_stderror=yes
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check_via=no    // (cmd. line: -v)
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dns=no          // (cmd. line: -r)
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rev_dns=no      // (cmd. line: -R)
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log_facility=MY_LOG_FACILITY
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// Define the listening ports and addresses
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port=MY_SIP_PORT
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tls_port_no=MY_SIPS_PORT
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// Define TCP parameters
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tcp_children=4
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tcp_no_connect=no
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tcp_rd_buf_size=16384
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tcp_max_connections=2048
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tcp_connection_lifetime=3605
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disable_tcp=no
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#!ifdef WITH_TLS
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enable_tls=yes
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#!endif
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listen=MY_IP4_ADDR
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#!ifdef WITH_LOCALHOST_SIP
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listen=IP4_LOCALHOST
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#!endif
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#!ifdef WITH_IPV6
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listen=MY_IP6_ADDR
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#!ifdef WITH_LOCALHOST_SIP
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listen=IP6_LOCALHOST
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#!endif
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#!endif
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#!ifdef WITH_WEBSOCKETS
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listen=MY_WS4_ADDR
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#!ifdef WITH_LOCALHOST_WS
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listen=LOCALHOST_WS4_ADDR
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#!endif
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#!ifdef WITH_IPV6
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listen=MY_WS6_ADDR
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#!ifdef WITH_LOCALHOST_WS
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listen=LOCALHOST_WS6_ADDR
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#!endif
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#!endif
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#!ifdef WITH_TLS
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listen=MY_WSS4_ADDR
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#!ifdef WITH_LOCALHOST_WS
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listen=LOCALHOST_WSS4_ADDR
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#!endif
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#!ifdef WITH_IPV6
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listen=MY_WSS6_ADDR
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#!ifdef WITH_LOCALHOST_WS
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listen=LOCALHOST_WSS6_ADDR
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#!endif
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#!endif
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#!endif
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#!endif
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force_rport=yes // Add received port to VIA
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loadmodule "pv.so"          // Pseudo-Variable support
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loadmodule "xlog.so"        // Formatted logging support
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loadmodule "sl.so"          // Stateless request handling
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loadmodule "siputils.so"    // SIP utility helpers
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loadmodule "sanity.so"      // Sanity check
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loadmodule "maxfwd.so"      // Support for Max-Forward header
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loadmodule "textops.so"     // Text operations on SIP messages
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loadmodule "textopsx.so"    // Extended Text operations on SIP messages
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loadmodule "sdpops.so"      // SDP operations
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loadmodule "nathelper.so"   // NAT traversal helpers
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loadmodule "rr.so"          // Record Route handling
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loadmodule "outbound.so"    // Outbound support
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loadmodule "path.so"        // Path handling
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#!ifdef WITH_TLS
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loadmodule "tls.so"         // TLS Support
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#!endif
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#!ifdef WITH_WEBSOCKETS
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loadmodule "xhttp.so"       // XHTTP support
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loadmodule "websocket.so"   // WebSocket support
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#!endif
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loadmodule "rtpengine.so"   // RTPEngine control
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#!ifdef WITH_DEBUG
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loadmodule "debugger.so"
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#!endif
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When I start Kamailio, I see the following in the output to stderr:
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Listening on
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         udp: 172.16.0.57:5060

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         tcp: 172.16.0.57:5060

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Aliases:
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         tcp: VRTPENGINE:5060

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         udp: VRTPENGINE:5060

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WARNING: no fork mode
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0(6299) INFO: <core> [core/tcp_main.c:5042]: init_tcp(): using epoll_lt
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as the io watch method (auto detected)
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Here's the problem:
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When I connect via UDP, everything works fine. I can connect and see all
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SIP traffic.
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However, if I try to connect via TCP, I see the initial SYN packet in
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attempting to establish a connection.
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Kamailio responds with an [RST,ACK] message and the TCP connection is
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never established. No further TCP traffic is sent.
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Any ideas on what I'm doing wrong?
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https://www.google.com/maps/search/3400%0D%0A+North+Ashton+Blvd,+Suite+470+%0D%0A+Lehi,%0D%0A+Utah+84043?entry=gmail&source=g
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*Peter H. Manley, Ph.D.*
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Chief Software Architect
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KomBea Corporation
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3400 North Ashton Blvd, Suite 470
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https://urldefense.proofpoint.com/v2/url?u=https-3A__maps.google.com_-3Fq-3D3400-2BNorth-2BAshton-2BBlvd-2C-2BSuite-2B470-2B-250D-250A-2BLehi-2C-2BUtah-2B84043-26entry-3Dgmail-26source-3Dg&d=DwMF-g&c=aXfg9j-An5sFdflqnjAj_USiCjXm5xEBIX8lTgWEt0U&r=ykVOlDeeWPn-JjTs8avieNrFskQ3kNzjf6_Jn_wG5HLeLIRsvzCN4-dJx6BFR4el&m=MMSIepRfj2CXVMH3CH8SghyPAoonRISMH__5bcNFPLM&s=C4toC0HQ2JwHKiamawbqvdjdidlwyhCP0XVneFagwkY&e=
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Lehi, Utah 84043
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https://urldefense.proofpoint.com/v2/url?u=https-3A__maps.google.com_-3Fq-3D3400-2BNorth-2BAshton-2BBlvd-2C-2BSuite-2B470-2B-250D-250A-2BLehi-2C-2BUtah-2B84043-26entry-3Dgmail-26source-3Dg&d=DwMF-g&c=aXfg9j-An5sFdflqnjAj_USiCjXm5xEBIX8lTgWEt0U&r=ykVOlDeeWPn-JjTs8avieNrFskQ3kNzjf6_Jn_wG5HLeLIRsvzCN4-dJx6BFR4el&m=MMSIepRfj2CXVMH3CH8SghyPAoonRISMH__5bcNFPLM&s=C4toC0HQ2JwHKiamawbqvdjdidlwyhCP0XVneFagwkY&e=
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www.kombea.comhttp://www.kombea.com
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https://urldefense.proofpoint.com/v2/url?u=http-3A__www.kombea.com_&d=DwMF-g&c=aXfg9j-An5sFdflqnjAj_USiCjXm5xEBIX8lTgWEt0U&r=ykVOlDeeWPn-JjTs8avieNrFskQ3kNzjf6_Jn_wG5HLeLIRsvzCN4-dJx6BFR4el&m=MMSIepRfj2CXVMH3CH8SghyPAoonRISMH__5bcNFPLM&s=ocueS1ZL34IN6qr14M-aItGjeJGQ2km5U2zpzO4Fyqw&e=
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Office:+1.801.610.5808
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Mobile +1.801.243.7773
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Re: [SR-Users] Unable to establish TCP connection with Kamailio