UE ping gets replied one time, then stops

Hi,

I have set up a ULCL deployment with 2 upfs ( i-upf -psa-upf). I use UERANSIM for the RAN-part. I have followed all the required steps and everything seems to work fine until the UE gets connected. But when i try to ping anything from the UE if, only the first ping succeeds and all of the following ones do not get replied. My set up is configured over openstack and i use 3 instances for free5gc (1core, 2upfs).

Does anyone have any idea why this mysterious thing is happening?

I am attaching a screenshot of my deployment as well as my wireshark traces from the upfs.

Thanks in advance!
iupf.pcap (20.1 KB) psupf.pcap (16.6 KB)