Port Scan Results for
Port scanner methodology
This check attempts TCP connections from the OpsCheck server to the submitted host and selected ports. It reports reachability from this server path; it is not a stealth scan, packet-level scanner, or advanced vulnerability scanner.
How the scan is performed
- A successful TCP connection is reported as open because the remote host completed the handshake.
- Refused connections usually indicate a reachable host with no listener on that port, or a firewall actively rejecting traffic.
- Timeouts usually indicate filtering, packet loss, routing problems, or provider-level blocking rather than a confirmed closed service.
Operational caveats
- NAT, cloud security groups, host firewalls, load balancers, and ISP filtering can change external visibility.
- A port open from this server may be closed from another network, and the reverse can also happen.
- Service banners and application-layer checks are not inferred unless the result explicitly shows them.
Use results safely
- Treat open ports as exposure signals to review, not as proof of a vulnerability.
- Verify unexpected findings from another trusted network path before changing firewall rules.
- For TLS services, follow up with the TLS scanner or SSL certificate checker.
Related checks
A timeout usually means packets were dropped or the response did not return before the limit. Firewalls, ACLs, security groups, NAT, routing loss, and provider filtering can all produce timeouts.
No. An open port only means a TCP service was reachable from this server. Vulnerability status depends on the service, version, configuration, authentication, and exposure context.
Local checks may bypass perimeter firewalls, NAT, cloud security groups, or ISP filters. External scans see the service from the public network path used by the scanning server.