I assume the other services are in the same environment?

Yes

I have a bff service and the configuration is same to another services

What's a "bff service"?

rrf-bff-api

If i add the public DNS, it works

What do you mean by "adding the public DNS"? Using public instead of private nwroking?

Sanity check, but rrf-api-reports.railway.internal is the URL shown as the private networking URL in the service settings right?

Public Networking, with a domain public

The bff service connect with others services via private network, it works. But, only rrf-api-reports not work it

I used the agent to resolve it and the agent created a function to check the endpoint /health-check/, same error

Yes

You're trying to access private networking through a function right?

You added a port as well when trying to access the URL right? (eg, rrf-api-reports.railway.internal:8080)

Yes, i added the port 3000

http://rrf-api-reports.railway.internal:3000 for example

The service rrf-api-reports is running with this port

check, from bff try send a request to http://rrf-api-reports.railway.internal:3000/subscriptions/reports/daily?startDate=2026-05-01&endDate=2026-05-27&page=1&limit=10 and the response with a ECONNREFUSED error

If change the network to public, works it!

I am having issues, both private/public connections to my postgres instance is not working.

after a redeploy its working