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TNS-12564: TNS:connection refused while reinstating a failed database

One of the reasons for getting this error might be that the sqlnet.ora does not contain the proper settings like in this particular case: As you can see there is nothing set in sqlnet.ora. Therefor when I was trying to reinstate a former PRIMARY as STANDBY, I was seeing in alert log of the reinstated…

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April 12, 2020mardaffDatabase, DataguardDGMGRL, TNS-12564, TNS:connection refused
ora-base.com