Hello Kamailio Community,
We're experiencing a *critical issue* in Kamailio where S-CSCF randomly stops sending CER to HSS in some cases after establishing TCP connections, causing complete authentication failures. Please find the attached (IMS containers + HSS )logs and the current configuration. *Environment* - *Kamailio Version:* kamailio 6.0.2 (x86_64/linux) d4dc5d - *Deployment:* SCSCF and HSS as a container on same physical machine using macvlan networking *Components:* - SCSCF: 172.22.1.20 - HSS: 172.22.1.3 - ICSCF: 172.22.1.19 *Problem Description* *The issue occurs randomly* - the system works normally for periods of time, then suddenly the Diameter connection between SCSCF and HSS fails and enters a reconnection seems loop. *Here's the cycle we're observing:* *1. *SCSCF: WARNING: cdp [peermanager.c:337]: peer_timer(): Inactivity on peer [hss.epc.mnc092.mcc418.3gppnetwork.org] and no DWA, Closing peer... *2. State Timeout (~40 seconds later):* S-CSCF: ERROR: cdp [peerstatemachine.c:164]: sm_process(): in state Closed timeout event Timeout *3. Reconnection Attempt (~30 seconds later):* SCSCF: INFO: cdp [peerstatemachine.c:551]: I_Snd_Conn_Req(): Peer hss.epc.mnc092.mcc418.3gppnetwork.org SCSCF: INFO: cdp [receiver.c:991]: peer_connect(): Trying to connect to 172.22.1.3 port 3870 SCSCF: INFO: cdp [receiver.c:1090]: peer_connect(): Peer hss.epc.mnc092.mcc418.3gppnetwork.org:3870 connected *4. HSS Side (waiting indefinitely):*HSS: [hss:0.19.37] 2025/12/25 04:46:39.060208 [INF] [scscf>hss:0][waiting for CER from 172.22.1.20:33284] *Cascading Effects:* *ICSCF accumulates branches:* ICSCF: ERROR: tm [t_fwd.c:792]: add_uac(): maximum number of branches exceeded ICSCF: ERROR: tm [t_fwd.c:1771]: t_forward_nonack(): failure to add branches *Result:* each UE cannot be able to register to IMS and VoLTE service outage for all UEs Best regards, Qasim Loay
<<attachment: IMS_logs_,_scscf_xml_.zip>>
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