Hi,
I would suggest to use Putty as SSH/SFTP client to connect to your array (instad of CMD>Telnet of Windows). Also make sure 1° the required services are active from the SMU and that 2) the userID as the permissions to use them.
Bonus question: Are you using LDAP to connect to your array? If yes, then unecure protocols (Telnet / FTP) will be disabled.
Cheers,
Dardan