ORA-12561 with SSL connectivity attempt from non-Oracle client (Doc ID 2383086.1)

Last updated on APRIL 01, 2019

Applies to:

Symptoms

1. When attempting to connect from a remote (AWS) Client to an Oracle Database using SSL / TLS the connection fails:
[errType=ERROR_RESPONSE, status=1022307, errMessage=ORA-12561: TNS:unknown error OCI error., errDetails=]

Local connections to the same Database using the same SSL configuration works.

2. There may also be errors in the Listener log, indicating a similar error with some additional entries:

Changes

1. Possible attempts to configure AWS (Amazon Web / Cloud Services) using:
https://docs.aws.amazon.com/dms/latest/userguide/CHAP_Security.SSL.html

2. Possible security scanning software such as DataDog Network Monitoring program.

Cause

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