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Kerberos

There are four Kerberos ports in the /etc/services file: TCP port 88, UDP port 88, TCP port 750, and UDP port 750. These ports are used only for outbound connections from your storage system. Your storage system does not run Kerberos servers or services and does not listen on these ports.

Kerberos is used by your storage system to communicate with the Microsoft Active Directory servers for both CIFS authentication and, if configured, NFS authentication.