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I think it's not reliable because those ports are used for FTP, SSH and SFTP but I am not sure that's the correct response in respect for Oracle DBA

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  • I think you're confusing tnsping with ping. tnsping is protocol (TNS) specific
    – Philᵀᴹ
    Commented Feb 24, 2019 at 10:42

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Read this carefully: Using the TNSPING Utility to Test Connectivity from the Client

Take a look at the Stack Overflow answer: When using tnsping, can I specify a port number along with the SID?

You can specify destination port in tnsnames.ora or I think you can use EZCONNECT syntax.

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