"The Network Adapter could not establish the connection" While Connecting From SQL Developer using SCAN
(Doc ID 2138671.1)
Last updated on AUGUST 04, 2018
Applies to:Oracle SQL Developer - Version 3.0 to 4.1 [Release 3 to 4]
Information in this document applies to any platform.
JDBC connection to database from SQL*Developer 3.x works at times, but fails most times with the following error:
IO Exception: The Network Adapter could not establish the connection
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