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Can port 25 be used for TLS 1.2 AutoSupport via SMTPS

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Applies to

  • ONTAP 9.15 and later
  • AutoSupport (ASUP)
  • SMTP authentication using Transport Layer Security (TLS) 1.2

Answer

No, port 25 should not be used for TLS 1.2 AutoSupport via SMTPS:

  • Port 25: This port is reserved for standard SMTP, which transmits data in plain text. Since there's no encryption, any information sent via port 25 can be easily intercepted. 
  • Port 587: Starting with ONTAP 9.15.1, it is possible to secure SMTP traffic using explicit TLS. This means that after a TCP connection is established, a TLS handshake begins to encrypt the communication, thereby protecting your data.

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