Administrator
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Yes,
You can implement Valid Node Checking Valid Node Checking For Registration (VNCR)(Doc ID 1600630.1)
You can also use Class of Secure Transport (COST) to Restrict Instance Registration -> (Doc ID 1453883.1)
Always be in an up-to-date patchset (for having the bug fixes)
You can also check this note for securing listener -> How To Network Secure Your Oracle Database Listener in Intranet / Internet (Doc ID 364388.1)
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