srsUE attach fails through srsGNB to Open5GS (ZMQ)

[hs3387]

Issue Description

I wasn't sure whether to post this in the 4g git or the 5g git, but since it's a 5g core, gnb, and nr band use in srsUE, I'm posting here.

My UE attachment keeps getting rejected. It receives the release command then sits there until I exit the program

I don't see anything happening in the gnb console during this, it's just blank.

I see this series of packets flowing between gnb and the core

UE Sim config

Core UE config

Setup Details

srsUE and GNB running on ubuntu 20.04 LTS - connected through ZeroMQ Open5GS running on another Ubuntu 20.04 (was able to attach a UE with a GNB running a USRP B210)

Expected Behavior

UE should attach and authenticate successfully

Actual Behaviour

UE/Core rejects authentication Core logs and pcap don't specify reason for rejection

[herlesupreeth]

Please post a pcap of NGAP interface and all the relevant configuration files.

just by looking at screenshot of pcap I see Authentication Reject so that indicates there is some issue in the UE SIM configuration (either at 5GC or Ki or OPc is wrong)

[hs3387]

gnbx.yaml.txt uezmq2.conf.txt tail amf.log.txt pcaps.zip

This is the only info i could gather from pcap but no idea what to make of it

[hs3387]

amf.yaml.txt

[herlesupreeth]

As mentioned earlier Authentication Reject indicates that there is some issue in the UE SIM configuration (either at 5GC or Ki or OPc is wrong)

I would suggest changing the following parameters in UE configuration file and give it a try (to eliminate the possibility of wrongly generated OPc value from Ki and OP)

opc  = 8E27B6AF0E692E750F32667A3B14605D
k    = 8baf473f2f8fd09487cccbd7097c6862

[hs3387]

I changed this, still getting auth reject

[hs3387]

Actually, buried deep in some logs I found this

[NAS5G ] [E] Registration Reject: PLMN not allowed

However, you can see that the first 6 digits of my IMSI match the MCC MNC

[hs3387]

@herlesupreeth It looks like srsue is only taking the first 5 digits of my IMSI as the PLMN It needs to take 6? How do I set this?

[herlesupreeth]

Please post the pcap to know better where the issue is. I would suggest changing MNC from 010 to say 100 i.e. non-leading zero number.

[pgawlowicz]

@hs3387 Any update on this issue?

[hs3387]

Nope, I have tried different official guides and some random thoughts too. Nothing seems to work.

Regardless of whyther Im using a physical sim (pcsc) or typing the usim info in the ue config, I keep getting MAC failures. Even tried a sim that works on a mobile phone with a physical gnb with the same core.

On Wed, Jan 24, 2024, 2:17 AM Piotr @.***> wrote:

@hs3387 https://github.com/hs3387 Any update on this issue?

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[pgawlowicz]

Do you run the dockerized Open5gs provided in srsRAN_Project repo?

[azzukky]

I am facing exactly the same issue when I run an installed open5gs on my desktop. But when I run the dockerized version from srsran, it works. ANY tip to solve this?

[azzukky]

I am facing exactly the same issue when I run an installed open5gs on my desktop. But when I run the dockerized version from srsran, it works. ANY tip to solve this?

[pgawlowicz]

Note that the dockerized version is shipped with configs for each Open5GC service and the UE database is properly populated. You should be able to achieve the same effect with your own installation.