Title

The system must set maximum number of incoming connections to 1024. (Cat III impact)

Discussion

This setting controls the maximum number of incoming connections that can be accepted on a TCP port limiting exposure to denial of service attacks.

Check Content

Determine if the maximum number of incoming connections is set to 1024. # ipadm show-prop -p _conn_req_max_q -co current tcp If the value returned is smaller than "1024", this is a finding. In environments where connection numbers are high, such as a busy web server, this value may need to be increased.

Fix Text

The Network Management profile is required. Configure maximum number of incoming connections. # pfexec ipadm set-prop -p _conn_req_max_q=1024 tcp

Additional Identifiers

Rule ID: SV-216142r603268_rule

Vulnerability ID: V-216142

Group Title: SRG-OS-000480

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.