Error while connecting UE to Open5Gs

[MShayanNazeer]

Hi
I have been trying to connect PacketRusher to Open5Gs however amf keep on rejecting my UE.
I receive following error at PacketRusher:

INFO[0001] [GNB][NGAP] Receive Downlink NAS Transport   
INFO[0001] [UE][NAS] Message without security header    
ERRO[0001] [UE][NAS] Receive Registration Reject        
ERRO[0001] [UE][NAS] UE received a 5GMM Failure, cause: Protocol error, unspecified. Please share the pcap with packetrusher@hpe.com. 
INFO[0001] [GNB][NGAP] Receive UE Context Release Command 
INFO[0001] [GNB] Initiating UE Context Complete         
WARN[0001] [UE][0000000000] Stopping UE as communication with gNB was closed 
INFO[0001] [GNB][NGAP] Releasing UE Context, cause: nas: Normal release 

on the AMF side, logs show following error:

07/29 12:10:45.430: [sbi] WARNING: [AUSF] (SCP-discover) NF has already been added [d3fa572a-4dd5-41ef-b04a-f922e31f81d7:1] (../lib/sbi/path.c:216)
07/29 12:10:45.442: [nas] WARNING: Spec warning : bcd[16] = 0x0, 0x30 (../lib/nas/common/conv.c:48)
07/29 12:10:45.447: [sbi] WARNING: [UDM] (SCP-discover) NF has already been added [d3f543ca-4dd5-41ef-8d9c-4bbc984a1efe:1] (../lib/sbi/path.c:216)
07/29 12:10:45.450: [sbi] WARNING: [UDM] (SCP-discover) NF has already been added [d3f543ca-4dd5-41ef-8d9c-4bbc984a1efe:2] (../lib/sbi/path.c:216)
07/29 12:10:45.451: [amf] ERROR: No Allowed-NSSAI (../src/amf/context.c:2920)
07/29 12:10:45.451: [amf] ERROR:     Number of Subscribed S-NSSAI [1] (../src/amf/context.c:2921)
07/29 12:10:45.451: [amf] ERROR:         Default S_NSSAI[SST:1 SD:0x1] (../src/amf/context.c:2926)
07/29 12:10:45.451: [amf] ERROR:     Number of Requested NSSAI [0] (../src/amf/context.c:2935)
07/29 12:10:45.451: [amf] ERROR:     (gNB) Number of TA List [1] (../src/amf/context.c:2947)
07/29 12:10:45.451: [amf] ERROR:         TAC:1 (../src/amf/context.c:2949)
07/29 12:10:45.451: [amf] ERROR:         Number of BPLMN List [1] (../src/amf/context.c:2950)
07/29 12:10:45.451: [amf] ERROR:         PLMN_ID[MCC:999 MNC:70] (../src/amf/context.c:2955)
07/29 12:10:45.451: [amf] ERROR:         Number of S_NSSAI [1] (../src/amf/context.c:2957)
07/29 12:10:45.451: [amf] ERROR:         S_NSSAI[SST:1 SD:0xffffff] (../src/amf/context.c:2964)
07/29 12:10:45.451: [amf] ERROR: No Allowed-NSSAI (../src/amf/nudm-handler.c:145)
07/29 12:10:45.451: [amf] WARNING: [suci-0-999-70-0000-0-0-0000000000] Registration reject [62] (../src/amf/nas-path.c:205)
07/29 12:10:45.451: [gmm] ERROR: [imsi-999700000000000] amf_nudm_sdm_handle_provisioned(am-data) failed (../src/amf/gmm-sm.c:2228)
07/29 12:10:45.453: [amf] INFO: UE Context Release [Action:3] (../src/amf/ngap-handler.c:1696)
07/29 12:10:45.453: [amf] INFO:     RAN_UE_NGAP_ID[1] AMF_UE_NGAP_ID[2] (../src/amf/ngap-handler.c:1697)
07/29 12:10:45.453: [amf] INFO:     SUCI[suci-0-999-70-0000-0-0-0000000000] (../src/amf/ngap-handler.c:1701)

Can someone kindly help me out, it would be highly appreciated.

[linouxis9]

Hi @MShayanNazeer,

I suspect a wrong configuration on either AMF or PacketRusher's side.
Could you share both configurations?

Thanks a lot!
Valentin

[MShayanNazeer]

Hi Valentin,
I apologize for the late reply. I researched the issue myself and it was the issue of wrong configuration file in packetrusher. The sd value in snassi was not matching the one with open5gs. However thankyou very much for your quick response.

Best