It is also possible that the database has not registered with the listener. Try restarting the database and try...
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connecting again to see whether this resolves the problem. Note that it can take 60 seconds for a database to register with a listener.
Finally, check the sqlnet.ora file to determine whether NAMES.DIRECTORY_PATH = (HOSTNAME). Comment this line out and try connecting again. When this parameter is set to HOSTNAME, SQL*Plus is using only the hostname to attempt to identify the remote database SID and resolve the address.
Dig Deeper on Oracle database installation, upgrades and patches
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