TNS-12520 connecting via the Listener and Service shows as "Blocked" and Oracle SQL Tuning Advisor is running
(Doc ID 1934932.1)
Last updated on FEBRUARY 10, 2020
Applies to:Oracle Net Services - Version 220.127.116.11 and later
Oracle Database - Enterprise Edition - Version 18.104.22.168 and later
Information in this document applies to any platform.
When attempting to connect to the Database instance via the Listener, you receive a TNS-12520 or TNS-12519 error.
A check of the listener status or services shows that the Service is "Blocked"
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