Information
Without confidentiality protection mechanisms, unauthorized individuals may gain access to sensitive information via a remote access session.
Remote access is access to DoD nonpublic information systems by an authorized user (or an information system) communicating through an external, non-organization-controlled network. Remote access methods include, for example, dial-up, broadband, and wireless.
Encryption provides a means to secure the remote connection to prevent unauthorized access to the data traversing the remote access connection (e.g., RDP), thereby providing a degree of confidentiality. The encryption strength of a mechanism is selected based on the security categorization of the information.
Solution
Add or edit the following line in the '/etc/ssh/sshd_config' file to support 'Protocol 2' only:
Protocol 2
Save the change to /etc/ssh/sshd_config
Restart ssh daemon:
# stopsrc -s sshd
# startsrc -s sshd