unable to connect to Azure Postgres from Azure aks

Question

postgres@name-prod-psql-197fb74f68-9psrh:/$ psql "host=name-prod.postgres.database.azure.com port=5432 dbname=prod user=user password=XXX"

psql: error: could not connect to server: Connection timed out
    Is the server running on host "name-prod.postgres.database.azure.com" (10.110.0.4) and accepting
    TCP/IP connections on port 5432?

If I run traceroute inside the POD

[root@utils /]# traceroute name-prod.postgres.database.azure.com
traceroute to name-prod.postgres.database.azure.com (10.110.0.4), 30 hops max, 60 byte packets
 1  10-240-0-226.prometheus-node-exporter.prometheus.svc.cluster.local (10.240.0.226)  0.037 ms  0.019 ms  0.009 ms
 2  * * *
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It used to work for 8 days and then suddenly stopped.

• Postgres is placed in su.net 10.110.0.0/16
• Aks in prod-private-eks 10.240.0.0/16 with Microsoft.Sql service endpoint added

What could be the issue?

Answer 1

Would suggest you to Open a Firewall Port for PostgreSQL if haven't

Please refer this document to how to Open a Port in Windows Defender Firewall:

https://manifold.net/doc/mfd9/open_a_firewall_port_for_postgresql.htm

In PostgreSQL's case it's typical to use port 5432 if it is available. If it isn't, most installers will choose the next free port, usually 5433.

Reference: postgresql port confusion 5433 or 5432?