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I have 12.0.1.2 node RAC system on Linux 64 bit.
I had some e-mails from our developer team about database connection problems. They got “ORA-12541: TNS:no listener” error message.
I started to investigate issue by checking current status of services by using below command:
crsctl stat res -t
I noticed that SCAN_LISTENER service status were UNKNOWN.
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