How to set services to use unique ip address?

I have set ‘hosts’ kf, kc and ee with ip address 192.168.1.39, however the logs shows that connection are pointed to others ip.
is there env variables or other settings that force KBT services tu use one single IP ?

Here is a log’s portion of failed connection :

2023/02/02 18:29:56 [error] 47#47: *10 connect() failed (111: Connection refused) while connecting to upstream, client: 192.168.1.39, server: kf.kobo.local, request: “GET /service_health/ HTTP/1.1”, upstream: “uwsgi://192.168.96.4:8000”, host: “kf.kobo.local”
2023/02/02 18:30:06 [error] 45#45: *13 connect() failed (111: Connection refused) while connecting to upstream, client: 192.168.1.39, server: kf.kobo.local, request: “GET /service_health/ HTTP/1.1”, upstream: “uwsgi://192.168.96.4:8000”, host: “kf.kobo.local”
2023/02/02 18:46:16 [error] 44#44: *1 connect() failed (111: Connection refused) while connecting to upstream, client: 192.168.1.39, server: kf.kobo.local, request: “GET /service_health/ HTTP/1.1”, upstream: “uwsgi://192.168.128.4:8000”, host: “kf.kobo.local”
2023/02/02 18:46:26 [error] 47#47: *4 connect() failed (111: Connection refused) while connecting to upstream, client: 192.168.1.39, server: kf.kobo.local, request: “GET /service_health/ HTTP/1.1”, upstream: “uwsgi://192.168.128.4:8000”, host: “kf.kobo.local”

Thanks in advance.