The system must set maximum number of half-open TCP connections to 4096.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-216141 | SOL-11.1-050110 | SV-216141r959010_rule | CCI-000366 | medium |
| Description | ||||
| This setting controls how many half-open connections can exist for a TCP port. It is necessary to control the number of completed connections to the system to provide some protection against denial of service attacks. | ||||
| STIG | Date | |||
| Solaris 11 X86 Security Technical Implementation Guide | 2025-05-05 | |||
Details
Check Text (C-216141r959010_chk)
Determine if the number of half open TCP connections is set to 4096.
# ipadm show-prop -p _conn_req_max_q0 -co current tcp
If the value of "4096" is not returned, this is a finding.
Fix Text (F-17377r372806_fix)
The Network Management profile is required
Configure maximum TCP connections for IPv4 and IPv6.
# pfexec ipadm set-prop -p _conn_req_max_q0=4096 tcp