JDBC Connection Failure: Network Adapter Could not Establish Connection When Using Shared Server (Doc ID 139775.1)

Last updated on AUGUST 09, 2023

Applies to:

Symptoms

 You are attempting to connect to an Oracle instance using JDBC and you are receiving the following error.

java.sql.SQLException: Io exception:
The Network Adapter could not establish connection

SQLException: SQLState (null) vendor code (17002)

Any or all of the following conditions may also apply:

1) You are able to establish a SQL*Plus connection from the same client to the same Oracle instance.

2) You are able to establish a JDBC OCI connection, but not a Thin connection from the same client to the same Oracle instance.

3) The same JDBC application is able to connect from a different client to the same Oracle instance.

4) The same behavior applies whether the initial JDBC connection string specifies a hostname or an IP address.

Cause