| Port | Reason | |------|--------| | 53 | DNS client (outbound) | | 80/443 | Web browsing (outbound) | | 123 | NTP time sync | | 1900 | UPnP (if needed) – risky | | 3389 | RDP (only if remote desktop is used, change default port) |
After reviewing your open ports, any port that is "Listening" but not recognized should be investigated. Common ports like (HTTP), 443 (HTTPS), and 53 (DNS) are standard, but random high-number ports could indicate a background service or, in some cases, unauthorized software. windows 11 open ports
Get-NetTCPConnection -State Listen | Export-Csv -Path "open_ports_$(Get-Date -Format yyyyMMdd).csv" -NoTypeInformation | Port | Reason | |------|--------| | 53