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Expired SSL Certificates Cause Dispatchers Blocked (Doc ID 1369254.1)

Last updated on OCTOBER 20, 2011

Applies to:

Oracle Net Services - Version: to - Release: 9.2 to 11.2
Information in this document applies to any platform.


The listener.log displays the TNS-12516 errors all the time.

Also, 'lsnrctl services listener_name' command can show dedicated connections and/or dispatchers blocked, although the symptoms from <> do not apply:


"DEDICATED" established:6384 refused:0 state:blocked
"D000" established:2096 refused:0 current:500 max:500 state:blocked


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