Connection Refused from AKS cluster to Postgres Flex server

Shah, Apoorv-XT 0

Hi All,

I am getting connection refused error while connecting to Postgres Flex server from AKS Cluster pod. Same Postgres Flex server connection is working fine from PgAdmin.

Can someone please help what could be wrong configuration from AKS Network?

Sai Krishna Katakam 1,680 Reputation points Microsoft Vendor

2024-12-31T20:38:36.28+00:00

Hi Shah, Apoorv-XT,

Welcome to the Microsoft Q&A Platform! Thank you for asking your question here.

Could you please check the Postgres Flex server logs for any errors? This will help us determine whether the issue is related to the database IP whitelisting or an AKS cluster issue.
Sai Krishna Katakam 1,680 Reputation points Microsoft Vendor

2025-01-02T20:31:46.21+00:00

Hi Shah, Apoorv-XT,

Just checking in to see if you had a chance to review my comment on your question. Please let us know if it was helpful and feel free to reach out if you have any further queries.

Thank You.
Sai Krishna Katakam 1,680 Reputation points Microsoft Vendor

2025-01-03T20:23:36.6066667+00:00

Hi Shah, Apoorv-XT,

I wanted to check if you had the opportunity to review the information which was provided in my previous posted comment.

Thank You.
Shah, Apoorv-XT 0 Reputation points

2025-01-04T12:36:22.8366667+00:00

It is random connectivity issue. Few pods are able to connnect with Postgres Flex, however few pods are getting connection refused error.
Sai Krishna Katakam 1,680 Reputation points Microsoft Vendor

2025-01-07T04:26:50.18+00:00
Hi Shah, Apoorv-XT,

Thank you for providing additional information, the intermittent connection issues between your AKS cluster and the Postgres Flexible Server could stem from several factors. Here are key troubleshooting steps:

Verify that no network policies restrict traffic from specific pods to the Postgres server.

Make sure the Postgres server is configured with the correct service endpoints and accessible by the AKS cluster’s virtual network.

Check the pods configurations for correct environment variables or files for database connection.

Confirm the pods can resolve the Postgres server's hostname using DNS lookup.

Ensure resource limits (CPU/memory) aren’t causing pods to fail.

Review logs for connection errors and monitor both AKS and Postgres for patterns in resource usage.

Verify there are no firewall rules blocking traffic between the AKS cluster and the Postgres server.

For more information, please refer to the below documentation:
Azure Kubernetes Service (AKS) Networking
Troubleshoot connectivity issues in Azure Database for PostgreSQL
If you have any further queries, do let us know. If the comment is helpful, please click "Upvote".
Sai Krishna Katakam 1,680 Reputation points Microsoft Vendor

2025-01-08T07:40:31.3766667+00:00

Hi Shah, Apoorv-XT,

Just checking in to see if you had a chance to review my comment on your question. Please let us know if it was helpful and feel free to reach out if you have any further queries.

If you found the information useful, please click "Upvote" on the post to let us know.

Thank You.

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Connection Refused from AKS cluster to Postgres Flex server

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