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OCI-RAC DB SYSTEM:Database connection error "IO Error: The Network Adapter could not establish the connection" from outside OCI network (Doc ID 2596675.1)

Last updated on APRIL 29, 2024

Applies to:

Oracle Database Cloud Service - Version N/A and later
Information in this document applies to any platform.


Accessing OCI RAC db system from outside OCI VCN network by configuring windows putty tunneling

SQLdeveloper connection error : IO Error: The Network Adapter could not establish the connection


  1. Able to ssh to RAC nodes
  2. Listener is up and running
  3. Listener port is open
  4. services are registered with listener
  5. able to connect using service/connecting string (sqlplus <user>/<password>@<connecting_string>



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