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USER’S GUIDE
Switched Rack PDU
79
– Do not enable both versions of SSH unless you require that both be
activated at the same time. (Security protocols use extensive
processing power.)
• Configure the port settings for Telnet and SSH.
• Select one or more data encryption algorithms for SSH version 1, SSH
version 2, or both.
• In the Web interface, specify a host key file previously created with the
APC Security Wizard and load it to the Rack PDU.
• Display the fingerprint of the SSH host key for SSH versions 1 and 2.
Most SSH clients display the fingerprint at the start of a session.
Compare the fingerprint displayed by the client to the fingerprint that
you recorded from the Web interface or control console of the Rack
PDU
.
To use SSH, you must have an SSH client installed. Most
Linux and other UNIX
®
platforms include an SSH client as part
of their installation, but Microsoft
Windows operating systems
do not. SSH clients are available from various vendors.
From a command line interface, such as the command
prompt on Windows operating systems, you can use FTP or
Secure CoPy (SCP) to transfer the host key file. You must
transfer the file to location /sec on the Rack PDU.
If you do not specify a host key file, the Switched Rack PDU
generates an RSA host key of 768 bits, instead of the 1024-bit
RSA host key that the Wizard creates. The Rack PDU can
take up to 5 minutes to create this host key, and SSH is
not accessible during that time.