[amf] ERROR: Cannot decode NGAP message [amf] INFO: gNB-N2[127.0.0.1] connection refused!!! (../src/amf/amf-sm.c:793)

[ecipecipec]

Hi,

I'm trying to use your tool 5greplay with open5gs. I have exact configuration like you have on your git page. AMF ip is 127.0.0.5.
But I cannot get 5greplay to connect with NGAP protocol. After initical SCTP setup, I get SCTP shutdown from 5greplay.

When I replay included sa.pcap:
~/5greplay$ sudo ./5greplay replay -t pcap/sa.pcap -Xforward.default=FORWARD
mmt-5greplay: 5Greplay v0.0.8-86f2074 using DPI v1.7.10 (35f0ad71) is running on pid 48876
mmt-5greplay: Overridden value of configuration parameter 'forward.default' by '0'
mmt-5greplay: Binded successfully socket to 127.0.0.1:0 using SCTP.
mmt-5greplay: MMT-5Greplay 0.0.8 (86f2074 - Mar 29 2024 14:06:03) is verifying 1 rules having 2 proto.atts using the main thread
mmt-5greplay: Registered attribute to extract: 904.2
mmt-5greplay: Registered attribute to extract: 904.3
mmt-5greplay: Analyzing pcap file pcap/sa.pcap
mmt-5greplay: Statistics of forwarded packets 30971.00 pps (total: 30971 packets), 38898376.00 bps
Statistics of forwarded packets 30971.00 pps (total: 30971 packets), 38898376.00 bps

• rule 4 generated 1 verdicts
  43441 packets received
  43441 messages received
  1 alerts generated
  mmt-5greplay: Number of packets being successfully forwarded: 43441, dropped: 0
  Number of packets being successfully forwarded: 43441, dropped: 0

And from amf:
04/03 14:03:27.244: [core] WARNING: Failed to decode ASN-PDU [code:2,consumed:0] (../lib/asn1c/util/message.c:69)
04/03 14:03:27.244: [ngap] WARNING: Failed to decode NGAP-PDU (../lib/ngap/message.c:53)
04/03 14:03:27.244: [amf] ERROR: Cannot decode NGAP message (../src/amf/amf-sm.c:824)
04/03 14:03:27.288: [amf] INFO: gNB-N2[127.0.0.1] connection refused!!! (../src/amf/amf-sm.c:793)
04/03 14:03:27.288: [amf] INFO: [Removed] Number of gNBs is now 0 (../src/amf/context.c:1258

I attached 2 pcap. One is when I send mesage
damir_replay.zip
damir.zip
damir_replay.zip
damir.zip
s from simulator to open5gs: damir.pcap
And other is when I run damir.pcap with 5greplay: damir-replay.pcap

my5G-RANTester, 5greplay and open5gs are all installed in the same VM
Thank you in advance for any help