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6 CHAPTER 1: VCX SYSTEM SECURITY
Commands To enhance the security of VCX systems, these commands have been
disabled:
■ ftp
■ telnet
■ tftp
■ finger
■ ident
■ rlogin
■ rsh
■ rcp
To access a VCX system remotely, you must use one of these secure
commands:
■ ssh
■ sftp
The first time that you try to access your VCX system using the ssh or sftp
command, you may see a cautionary message asking you to confirm that
you want to accept a connection with the VCX system. If you answer yes,
the connection is made.
If you completely re-install the VCX system software for any reason, the
next time that you try to access the VCX system using the ssh or sftp
command, you may see a warning message that indicates that a “man in
the middle” security breach may be in process. This message is the result
of new confirmation codes that are generated during the VCX software
installation process. If you upgrade from one VCX release to another, no
new confirmation codes are generated.
To establish connection to the VCX system:
1 Delete the known_hosts file that is referred to in the warning message.
2 Retry the ssh or sftp command.