TNS-12520 connecting via the Listener and Service shows as "Blocked" and Oracle SQL Tuning Advisor is running
Last updated on OCTOBER 13, 2014
Applies to:Oracle Net Services - Version 22.214.171.124 and later
Oracle Database - Enterprise Edition - Version 126.96.36.199 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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