Hello,
Thank you for the clarification.
Unfortunately, it’s not possible to change the PostgreSQL port on Aiven, especially on the free plan — the port is assigned automatically and cannot be modified on my side. Aiven does not provide a setting to force a standard port like 5432.
Given this, please escalate the issue to check whether it’s possible to open the required outbound port on your side.
If this cannot be accommodated, that’s completely fine — just let me know.
Thank you for your help!