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"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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