What "open ports" means
| Service | Ports | Command (Admin) | |---------|-------|----------------| | SMB 1.0/CIFS | 445 | Disable-WindowsOptionalFeature -Online -FeatureName SMB1Protocol | | SMB 2.0/3.0 | 445 | Set-SmbServerConfiguration -EnableSMB2Protocol $false (careful) | | NetBIOS over TCP/IP | 137-139 | In network adapter → IPv4 → WINS → Disable NetBIOS | | LLMNR | 5355 | Group Policy → Computer Config → Admin Templates → Network → DNS Client → Turn off LLMNR | | mDNS | 5353 | Stop dnscache service or disable via registry | | Connected Devices | 5040 | Stop CDPSvc (may break dynamic lock, phone linking) | | Delivery Optimization | 7680 | Settings → Windows Update → Advanced → Delivery Optimization → Off | windows 11 open ports
Netstat (local listeners)