5 months ago
anyone has any idea how to debug that my service can't connect to postgres using internal network (Postgres.railway.internal) but the service connects fine through public url of postgres.
I received this error when trying to connect through internal network
2026/02/06 03:54:54 db connect error: dial tcp: lookup Postgres.railway.internal on [fd12::10]:53: no such host
2026/02/06 03:54:55 db connect error: dial tcp: lookup Postgres.railway.internal on [fd12::10]:53: no such host
2026/02/06 03:54:57 db connect error: dial tcp: lookup Postgres.railway.internal on [fd12::10]:53: no such host
2026/02/06 03:55:06 db connect error: dial tcp: lookup Postgres.railway.internal on [fd12::10]:53: no such host
2026/02/06 03:55:08 db connect error: dial tcp: lookup Postgres.railway.internal on [fd12::10]:53: no such host
Any tips to debug this issue, my app was deployed through docker container. Do I need other configuration for connect through intern network.
Thank you
Pinned Solution
5 months ago
I think I found an issue about the Postgres why it is failing. It was DNS is case-sensitive in many cloud environments. When your app looks for Postgres.railway.internal (Uppercase).
To avoid that,you go to Postgres instance and change it to lower case postgres.railway.internal
Attachments
4 Replies
5 months ago
I think I found an issue about the Postgres why it is failing. It was DNS is case-sensitive in many cloud environments. When your app looks for Postgres.railway.internal (Uppercase).
To avoid that,you go to Postgres instance and change it to lower case postgres.railway.internal
Attachments
5 months ago
This also worked for me, thankyou. Related thread: https://station.railway.com/questions/internal-networking-postgres-railway-in-0187bfa8
Status changed to Open brody • 5 months ago
5 months ago
Hello!
We're acknowledging your issue and attaching a ticket to this thread.
We don't have an ETA for it, but, our engineering team will take a look and you will be updated as we update the ticket.
Please reply to this thread if you have any questions!
5 months ago
✅ The ticket Private domain creation issue has been marked as completed.