I am trying to connect from Azure data factory to a Postgres Flexible server. I sticked to the official Microsoft documentation to achieve it: https://learn.microsoft.com/en-us/azure/postgresql/flexible-server/how-to-connect-to-data-factory-private-endpoint

I had a identical setup with a postgres single server which worked, however, using the flexible server leaves me with a connection timeout when testing the connection from adf side using the “Test connection” button on the “linked services” menu.

We checked for firewall rules and nsg settings, nothing is blocking the traffic. The only difference in setup is the postgres server itself, all other settings are identical.

How can I connect a postgres flexible server to the adf?