[SR-Users] Playing with Diameter - Error opening connection to :3868

Hello all, I am brand new to this list and I am also on a steep learning curve with Kamailio and Diameter.... so please be gentle as I am just starting! I am trying to look at the Diameter signaling and have a glimpse into the information passed. I have set up a compiled 5.2 on CentOS 7. I suspect that I am missing something obvious, but not sure what. I am seeing this error: INFO: cdp [peerstatemachine.c:525]: I_Snd_Conn_Req(): I_Snd_Conn_Req(): Peer peer_connect(): peer_connect(): Error opening connection to :3868 >Name or service not known It looks like the FQDN in the diameter.xml under 'peer' is not being resolved, as it is seeing port 3868? Any pointers would be greatly taken :-) Here is my diameter: <?xml version="1.0" encoding="UTF-8"?> <DiameterPeer         FQDN="mra1.testservers.xxx"         Realm="testservers.xxx"         Vendor_Id="10415"         Product_Name="CDiameterPeer"         AcceptUnknownPeers="1"         DropUnknownOnDisconnect="1"         Tc="30"         Workers="16"         QueueLength="32"         TransactionTimeout="5"         SessionsHashSize="128"         DefaultAuthSessionTimeout="3600"         MaxAuthSessionTimeout="3600"         <peer FGDN="mra2.testservers.xxx" Realm="testservers.xxx" proto="sctp" port="3868"/>         <Acceptor port="3868" bind="192.168.1.20"/>         <Auth id="16777251" vendor="10415"/>   <!-- 3GPP S6a/S6d -->         <SupportedVendor vendor="10415" /> </DiameterPeer> And here is what I am getting on the startup: Jan 28 14:19:35 telco-lon1-02 kamailio: INFO: <core> [core/tcp_main.c:4722]: init_tcp(): using epoll_lt as the io watch method (auto detected) Jan 28 14:19:35 telco-lon1-02 journal: [Diameter Routing Agent][22778]: INFO: <core> [main.c:2649]: main(): processes (at least): 29 - shm size: 67108864 - pkg size: 8388608 Jan 28 14:19:35 telco-lon1-02 journal: [Diameter Routing Agent][22778]: INFO: cdp [cdp_mod.c:240]: cdp_child_init(): CDiameterPeer child starting ... Jan 28 14:19:35 telco-lon1-02 journal: [Diameter Routing Agent][22783]: INFO: cdp [worker.c:332]: worker_process(): [1] Worker process started... Jan 28 14:19:35 telco-lon1-02 journal: [Diameter Routing Agent][22778]: INFO: cdp [cdp_mod.c:242]: cdp_child_init(): ... CDiameterPeer child started Jan 28 14:19:35 telco-lon1-02 journal: [Diameter Routing Agent][22790]: INFO: cdp [worker.c:332]: worker_process(): [8] Worker process started... Jan 28 14:19:35 telco-lon1-02 journal: [Diameter Routing Agent][22784]: INFO: cdp [worker.c:332]: worker_process(): [2] Worker process started... Jan 28 14:19:35 telco-lon1-02 journal: [Diameter Routing Agent][22786]: INFO: cdp [worker.c:332]: worker_process(): [4] Worker process started... Jan 28 14:19:35 telco-lon1-02 journal: [Diameter Routing Agent][22793]: INFO: cdp [worker.c:332]: worker_process(): [11] Worker process started... Jan 28 14:19:35 telco-lon1-02 journal: [Diameter Routing Agent][22794]: INFO: cdp [worker.c:332]: worker_process(): [12] Worker process started... Jan 28 14:19:35 telco-lon1-02 journal: [Diameter Routing Agent][22796]: INFO: cdp [worker.c:332]: worker_process(): [14] Worker process started... Jan 28 14:19:35 telco-lon1-02 journal: [Diameter Routing Agent][22788]: INFO: cdp [worker.c:332]: worker_process(): [6] Worker process started... Jan 28 14:19:35 telco-lon1-02 journal: [Diameter Routing Agent][22799]: INFO: cdp [receiver.c:455]: receiver_process(): receiver_process(): [] Receiver process doing init on new process... Jan 28 14:19:35 telco-lon1-02 journal: [Diameter Routing Agent][22799]: INFO: cdp [receiver.c:188]: add_serviced_peer(): add_serviced_peer(): Adding serviced_peer_t to receiver for peer [] Jan 28 14:19:35 telco-lon1-02 journal: [Diameter Routing Agent][22799]: INFO: cdp [receiver.c:460]: receiver_process(): receiver_process(): [] Receiver process starting up... Jan 28 14:19:35 telco-lon1-02 journal: [Diameter Routing Agent][22791]: INFO: cdp [worker.c:332]: worker_process(): [9] Worker process started... Jan 28 14:19:35 telco-lon1-02 journal: [Diameter Routing Agent][22792]: INFO: cdp [worker.c:332]: worker_process(): [10] Worker process started... Jan 28 14:19:35 telco-lon1-02 journal: [Diameter Routing Agent][22785]: INFO: cdp [worker.c:332]: worker_process(): [3] Worker process started... Jan 28 14:19:35 telco-lon1-02 journal: [Diameter Routing Agent][22787]: INFO: cdp [worker.c:332]: worker_process(): [5] Worker process started... Jan 28 14:19:35 telco-lon1-02 journal: [Diameter Routing Agent][22795]: INFO: cdp [worker.c:332]: worker_process(): [13] Worker process started... Jan 28 14:19:35 telco-lon1-02 journal: [Diameter Routing Agent][22782]: INFO: cdp [worker.c:332]: worker_process(): [0] Worker process started... Jan 28 14:19:35 telco-lon1-02 journal: [Diameter Routing Agent][22789]: INFO: cdp [worker.c:332]: worker_process(): [7] Worker process started... Jan 28 14:19:35 telco-lon1-02 journal: [Diameter Routing Agent][22797]: INFO: cdp [worker.c:332]: worker_process(): [15] Worker process started... Jan 28 14:19:35 telco-lon1-02 journal: [Diameter Routing Agent][22798]: INFO: cdp [receiver.c:455]: receiver_process(): receiver_process(): [] Receiver process doing init on new process... Jan 28 14:19:35 telco-lon1-02 journal: [Diameter Routing Agent][22798]: INFO: cdp [receiver.c:460]: receiver_process(): receiver_process(): [] Receiver process starting up... Jan 28 14:19:35 telco-lon1-02 journal: [Diameter Routing Agent][22800]: INFO: cdp [acceptor.c:81]: acceptor_process(): Acceptor process starting up... Jan 28 14:19:35 telco-lon1-02 journal: [Diameter Routing Agent][22800]: WARNING: cdp [tcp_accept.c:121]: create_socket(): create_socket(): Trying to open/bind/listen on 192.168.1.20 port 3868 Jan 28 14:19:35 telco-lon1-02 journal: [Diameter Routing Agent][22800]: WARNING: cdp [tcp_accept.c:146]: create_socket(): create_socket(): Successful socket open/bind/listen on 192.168.1.20 port 3868 Jan 28 14:19:35 telco-lon1-02 journal: [Diameter Routing Agent][22800]: INFO: cdp [acceptor.c:95]: acceptor_process(): Acceptor opened sockets. Entering accept loop ... Jan 28 14:19:35 telco-lon1-02 journal: [Diameter Routing Agent][22801]: INFO: cdp [timer.c:205]: timer_process(): Timer process starting up... Jan 28 14:19:35 telco-lon1-02 journal: [Diameter Routing Agent][22802]: INFO: ctl [io_listener.c:214]: io_listen_loop(): io_listen_loop:  using epoll_lt io watch method (config) Jan 28 14:19:36 telco-lon1-02 journal: [Diameter Routing Agent][22801]: INFO: cdp [peerstatemachine.c:525]: I_Snd_Conn_Req(): I_Snd_Conn_Req(): Peer Jan 28 14:19:36 telco-lon1-02 journal: [Diameter Routing Agent][22801]: WARNING: cdp [receiver.c:866]: peer_connect(): peer_connect(): Error opening connection to :3868 >Name or service not known Thanks, Steve