amouraos-postgis.internal nxdomain DNS error blocking production app

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Subject: amouraos-postgis.internal nxdomain DNS error blocking production app

My app “amouraos” cannot resolve “amouraos-postgis.internal” via DNS on the private network. Both apps are in region iad, same organization.

Error from logs: tcp connect (amouraos-postgis.internal:5432): non-existing domain :nxdomain

App details:

  • Main app: amouraos

  • DB app: amouraos-postgis

  • DB machine: d8de560a2d1308

  • Region: iad

  • DB machine is running and passing 1/1 health checks

  • pubsub is ok, only db is failing

This was working on March 24 2026 and stopped working recently. I need the two apps to communicate on the Fly private .internal network. Please advise.

2

It looks like your app is trying to resolve the domain for IPv4. Please note that Fly’s internal network is IPv6-only, so you will need to enable IPv6 support in order for this to work. For example for Phoenix Liveview apps I believe there is an inet6 option to be enabled.

3

Thanks :folded_hands:t5: so much will try and advise