APC ACRP100 User Manual

Use the options under Console on the left navigation menu to configure the following:

access

Choose one of the following:
• Disable: Disables all access to the control console.

• Enable Telnet (the default setting): Telnet transmits user names, passwords, and data 

without encryption.

• Enable SSH v1/v2: Do not enable both versions 1 and 2 of Secure SHell (SSH) unless you 

require that both be activated at the same time. (Security protocols use extensive processing 

power.)

• Enable SSH v1 only: Secure SHell (SSH) version 1 transmits user names, passwords, and 

data in encrypted form. There is little or no delay as you log on.

• Enable SSH v2 only: Secure SHell (SSH) version 2 transmits user names, passwords, and 

data in encrypted form with somewhat more protection than version 1 from attempts to 

intercept, forge, or alter data during transmission. There is a noticeable delay as you log on.

Identify the TCP/IP port used for communications with the cooling unit by Telnet and Secure 
SHell (SSH).
• Telnet Port: The default is 23.

• SSH Port: The default is 22.
You can change the Port setting to the number of any unused port from 5000 to 32768 to 
enhance the protection provided by User Name and Password settings.
• For Telnet, you must use either a colon (:) or a space in the command line, according to the 

requirements of your Telnet client program, to specify the non-default port number. For 

example, for a port number of 5000 and the cooling unit IP address of 152.214.12.114, your 

Telnet client requires one of the following commands:

telnet 152.214.12.114:5000

telnet 152.214.12.114 5000

• For SSH, see the documentation for your SSH client for the command line format required 

to specify a non-default port when starting SSH.

ssh 
encryption

Enable or disable encryption algorithms (block ciphers) compatible with SSH version 1 or 
version 2 clients:

SSH v1 algorithms: 
• DES 
• Blowfish: If your SSH v1 client cannot use Blowfish, which is always enabled, you must 

also enable DES.

SSH v2 algorithms:
• 3DES: (enabled by default)
• Blowfish: (enabled by default)
• AES 128 
• AES 256 

Your SSH v2 client selects the enabled algorithm that provides the highest security. If your 
SSH client cannot use the default algorithms, you must enable an AES algorithm that it can 
use.