The F5 BIG-IP appliance must be configured to limit the number of concurrent sessions to the Configuration Utility to 10 or an organization-defined number.

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 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.

Satisfies: SRG-APP-000001-NDM-000200, SRG-APP-000435-NDM-000315

From the BIG-IP GUI: 1. System. 2. Preferences. 3. Verify that System Settings view is set to Advanced. 4. Verify Maximum HTTP connections to Configuration Utility is set to 10 or an organization-defined number.

From the BIG-IP console, type the following command:

tmsh list sys httpd max-clients

If the device is not configured to limit the number of concurrent sessions to the Configuration Utility to 10 or an organization-defined number, this is a finding.

From the BIG-IP GUI: 1. System. 2. Preferences. 3. Set System Settings view to Advanced. 4. Maximum HTTP connections to Configuration Utility: enter 10 or an organization-defined number. 5. Update.

From the BIG-IP console, type the following commands:

tmsh modify sys httpd max-clients <10 or an organization-defined number> tmsh save sys config