AOS must limit the number of concurrent sessions to a maximum of three for each administrator account and/or administrator account type.

Device management includes the ability to control the number of administrators and management sessions that manage a device. Limiting the number of allowed administrators and sessions per administrator based on account type, role, or access type is helpful in limiting risks related to denial-of-service (DoS) attacks.

This requirement addresses concurrent sessions for administrative accounts and does not address concurrent sessions by a single administrator via multiple administrative accounts. The maximum number of concurrent sessions should be defined based on mission needs and the operational environment for each system. At a minimum, limits must be set for Secure Shell (SSH), Hypertext Transfer Protocol Secure (HTTPS), and account of last resort.

Verify the AOS configuration with the following command: show mgmt-user admin

If "Max-concurrent-sessions" is not set to "3", this is a finding.

Configure AOS with the following commands: configure terminal mgmt-user admin root max-concurrent-sessions 3 Enter the admin's password Reenter the admin's password write memory