Hi Pasan, Here is the log snippet as requested. Thanks for sparing time.
2018-05-03T14:20:02.000+08:00 [local2] [debug] msgct2-ccm-05a.apac.nsroot.net /usr/sbin/opensipsInternal[7527]: DBG:core:comp_scriptvar: str 20 : APACCITISGAP633.apac.nsroot.net 2018-05-03T14:20:02.000+08:00 [local2] [debug] msgct2-ccm-05a.apac.nsroot.net /usr/sbin/opensipsInternal[7527]: DBG:core:comp_scriptvar: str 29 : 169.178.164.139 2018-05-03T14:20:02.000+08:00 [local2] [debug] msgct2-ccm-05a.apac.nsroot.net /usr/sbin/opensipsInternal[7527]: DBG:core:pv_printf: final buffer length 42 2018-05-03T14:20:02.000+08:00 [local2] [debug] msgct2-ccm-05a.apac.nsroot.net /usr/sbin/opensipsInternal[7527]: Not Self URI, Routing the Outbound request 2018-05-03T14:20:02.000+08:00 [local2] [debug] msgct2-ccm-05a.apac.nsroot.net /usr/sbin/opensipsInternal[7527]: DBG:core:mk_proxy: doing DNS lookup... 2018-05-03T14:20:02.000+08:00 [local2] [debug] msgct2-ccm-05a.apac.nsroot.net /usr/sbin/opensipsInternal[7527]: DBG:core:sip_resolvehost: no port, no proto -> do NAPTR lookup! 2018-05-03T14:20:02.000+08:00 [local2] [debug] msgct2-ccm-05a.apac.nsroot.net /usr/sbin/opensipsInternal[7527]: DBG:core:get_record: lookup(APACCITISGAP633.apac.nsroot.net, 35) failed 2018-05-03T14:20:02.000+08:00 [local2] [debug] msgct2-ccm-05a.apac.nsroot.net /usr/sbin/opensipsInternal[7527]: DBG:core:sip_resolvehost: no valid NAPTR record found for APACCITISGAP633.apac.nsroot.net, trying direct SRV lookup... 2018-05-03T14:20:02.000+08:00 [local2] [debug] msgct2-ccm-05a.apac.nsroot.net /usr/sbin/opensipsInternal[7556]: DBG:core:get_record: lookup(APACCITISGAP633.apac.nsroot.net, 35) failed 2018-05-03T14:20:02.000+08:00 [local2] [debug] msgct2-ccm-05a.apac.nsroot.net /usr/sbin/opensipsInternal[7556]: DBG:core:sip_resolvehost: no valid NAPTR record found for APACCITISGAP633.apac.nsroot.net, trying direct SRV lookup... 2018-05-03T14:20:02.000+08:00 [local2] [debug] msgct2-ccm-05a.apac.nsroot.net /usr/sbin/opensipsInternal[7544]: DBG:core:get_record: lookup(APACCITISGAP633.apac.nsroot.net, 35) failed 2018-05-03T14:20:02.000+08:00 [local2] [debug] msgct2-ccm-05a.apac.nsroot.net /usr/sbin/opensipsInternal[7544]: DBG:core:sip_resolvehost: no valid NAPTR record found for APACCITISGAP633.apac.nsroot.net, trying direct SRV lookup... 2018-05-03T14:20:02.000+08:00 [local2] [debug] msgct2-ccm-05a.apac.nsroot.net /usr/sbin/opensipsInternal[7527]: DBG:core:get_record: lookup(_sip._udp.APACCITISGAP633.apac.nsroot.net, 33) failed 2018-05-03T14:20:02.000+08:00 [local2] [debug] msgct2-ccm-05a.apac.nsroot.net /usr/sbin/opensipsInternal[7527]: DBG:core:sip_resolvehost: no valid SRV record found for _sip._udp.APACCITISGAP633.apac.nsroot.net, trying A record lookup... 2018-05-03T14:20:02.000+08:00 [local2] [debug] msgct2-ccm-05a.apac.nsroot.net /usr/sbin/opensipsInternal[7544]: DBG:core:get_record: lookup(_sip._udp.APACCITISGAP633.apac.nsroot.net, 33) failed 2018-05-03T14:20:02.000+08:00 [local2] [debug] msgct2-ccm-05a.apac.nsroot.net /usr/sbin/opensipsInternal[7544]: DBG:core:sip_resolvehost: no valid SRV record found for _sip._udp.APACCITISGAP633.apac.nsroot.net, trying A record lookup... 2018-05-03T14:20:02.000+08:00 [local2] [debug] msgct2-ccm-05a.apac.nsroot.net /usr/sbin/opensipsInternal[7544]: DBG:core:check_ip_address: params 169.178.164.139, 169.178.164.139, 0 2018-05-03T14:20:02.000+08:00 [local2] [debug] msgct2-ccm-05a.apac.nsroot.net /usr/sbin/opensipsInternal[7527]: DBG:core:check_ip_address: params 169.178.164.139, 169.178.164.139, 0 2018-05-03T14:20:02.000+08:00 [local2] [debug] msgct2-ccm-05a.apac.nsroot.net /usr/sbin/opensipsInternal[7527]: DBG:core:forward_request: sending: UPDATE sip:[email protected] SIP/2.0^M To: <sip:[email protected]>;tag=70d57330-0-13c4-55015-128fe2-1a5f9bbc-128fe2^M Min-SE: 1800^M Via: SIP/2.0/UDP 169.178.164.139:5060;branch=z9hG4bKc6fef69f4ed2fb3bd0e91281d5c4020f^M Via: SIP/2.0/UDP 169.178.164.139:5059;wlsscid=6aa6b97cdedafbd6;branch=z9hG4bKc6fef69f4ed2fb3bd0e91281d5c4020f;wlsssid=sip-1rzjxdsgbytf2^M CSeq: 409 UPDATE^M Content-Length: 0^M Supported: timer^M Call-ID: 6b628520-0-13c4-55015-128fe2-191db136-128fe2^M Max-Forwards: 69^M From: <sip:[email protected]>;tag=dfe3def8^M Contact: <sip:[email protected]:5059;transport=udp;wlsscid=6aa6b97cdedafbd6;sipappsessionid=app-24d5358i5l6w>^M Session-Expires: 1800;refresher=uac^M ^M . 2018-05-03T14:20:02.000+08:00 [local2] [debug] msgct2-ccm-05a.apac.nsroot.net /usr/sbin/opensipsInternal[7544]: DBG:core:forward_request: sending: UPDATE sip:[email protected] SIP/2.0^M To: <sip:[email protected]>;tag=70d59118-0-13c4-55015-128fed-2a2859d4-128fed^M Min-SE: 1800^M Via: SIP/2.0/UDP 169.178.164.139:5060;branch=z9hG4bK150dc9d5e66cf821aa76beaef7018c02^M Via: SIP/2.0/UDP 169.178.164.139:5059;wlsscid=6aa6b97cdedafbd6;branch=z9hG4bK150dc9d5e66cf821aa76beaef7018c02;wlsssid=sip-nvozupkkym7b^M CSeq: 409 UPDATE^M Content-Length: 0^M Supported: timer^M Call-ID: 6b6291e0-0-13c4-55015-128fed-612714d6-128fed^M Max-Forwards: 69^M From: <sip:[email protected]>;tag=3a0cd8d6^M Contact: <sip:[email protected]:5059;transport=udp;wlsscid=6aa6b97cdedafbd6;sipappsessionid=app-6yjtry48v61h>^M Session-Expires: 1800;refresher=uac^M ^M . 2018-05-03T14:20:02.000+08:00 [local2] [debug] msgct2-ccm-05a.apac.nsroot.net /usr/sbin/opensipsInternal[7527]: DBG:core:forward_request: orig. len=682, new_len=735, proto=1 2018-05-03T14:20:02.000+08:00 [local2] [debug] msgct2-ccm-05a.apac.nsroot.net /usr/sbin/opensipsInternal[7544]: DBG:core:forward_request: orig. len=681, new_len=734, proto=1 2018-05-03T14:20:02.000+08:00 [local2] [err] msgct2-ccm-05a.apac.nsroot.net /usr/sbin/opensipsInternal[7527]: ERROR:core:udp_send: sendto(sock,0x7f3d6312d058,735,0,0x7ffdc8e38770,16): Operation not permitted(1) 2018-05-03T14:20:02.000+08:00 [local2] [debug] msgct2-ccm-05a.apac.nsroot.net /usr/sbin/opensipsInternal[7544]: DBG:core:destroy_avp_list: destroying list (nil) 2018-05-03T14:20:02.000+08:00 [local2] [err] msgct2-ccm-05a.apac.nsroot.net /usr/sbin/opensipsInternal[7527]: ERROR:core:msg_send: udp_send failed 2018-05-03T14:20:02.000+08:00 [local2] [debug] msgct2-ccm-05a.apac.nsroot.net /usr/sbin/opensipsInternal[7544]: DBG:core:receive_msg: cleaning up From: Pasan Meemaduma [mailto:[email protected]] Sent: Sunday, May 06, 2018 4:55 AM To: [email protected]; Govindaraj, Rajesh <[email protected]> Subject: Re: RE: Re: [OpenSIPS-Users] udp send fail randomly Is this simultaneous sending the cause for the issue? Just thinking aloud. It is happening at only one installation and never in lab systems, which makes me think if it is a timing issue. I don't think it'll be a problem,but I can give more clues if u share the snippet involve with this error. Yes, connection tracking to be turned off. if ct is on and you running out of simulatneous connection counters for some reason, It could be the issue. DISCLAIMER: This e-mail may contain information that is confidential, privileged or otherwise protected from disclosure. If you are not an intended recipient of this e-mail, do not duplicate or redistribute it by any means. Please delete it and any attachments and notify the sender that you have received it in error. Unintended recipients are prohibited from taking action on the basis of information in this e-mail. 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