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How to troubleshoot this error?

in Database Networking (MOSC) 17 commentsAnswered ✓

Source - Oracle database 19c on Oracle Linux 7

Target - Oracle 19c on Windows 2012 R2 Data center


The query from the source uses a DB Link to connect to the target.


The query from the source to the target throws this error -

PLS-00352: Unable to access another database


The database alert log on the target shows these errors.

Fatal NI connect error 12170.

TNS-12535: TNS:operation timed out


The Windows Firewall (on the target) is turned on.

There are no other Firewalls between the source and the target.


How to troubleshoot this error?

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