ORA-12637 Packet receive failed

Hi,

I understand that you have created a new RDS oracle 19c instance but you are unable to connect to it via SQL client getting error “ORA-12637 Packet receive failed”. Please correct me if I misunderstood.

You can start by checking the state of your Amazon RDS for Oracle DB instance.If the instance is in any state other than available, storage optimization, or backing-up, then you can't connect to the instance[1]. Secondly verify that you can connect to the database instance over the database port[2] by default oracle uses port 1521.For further assistance you can contact AWS Customer Support to review/validate or to get your instance available.

You can refer to the following documents on troubleshooting issues

Reference links:

[1]https://aws.amazon.com/premiumsupport/knowledge-center/rds-cannot-connect/

[2]https://aws.amazon.com/premiumsupport/knowledge-center/rds-oracle-connection-errors/

I hope you find this information useful.