Free browser-based developer tool

Port Command Generator

Choose a port, operating environment, and task. Get copy-ready diagnostic commands without uploading system details or installing anything.

1. Describe the target

Commands update instantly. Nothing is executed in this page.

Use a path such as /, /api/health, or /_cluster/health.

Private by design: generation happens in your browser. The page makes no diagnostic request to your localhost.

2. Run these commands

Start with the read-only checks, then compare the listener, process, and HTTP result.

What the generated commands tell you

Transport layer

Is anything listening?

Check the port state and whether it is bound only to IPv4, only to IPv6, or to every interface.

Process layer

What owns the port?

Resolve the listener PID to an application before deciding whether to reconfigure or stop it.

Application layer

What does HTTP return?

Inspect the response status, headers, and redirect chain separately from basic TCP connectivity.

Safety rule: never paste an unfamiliar termination command into an elevated shell. Read the PID or container name first. Binding a server to 0.0.0.0 can expose it to other devices on the same network.

Command references

Need a shareable system report?

This generator prepares individual commands but does not run them. The open-source localhost-doctor CLI in this project can combine listener, network, proxy, hosts, WSL, Docker, and HTTP checks into a redactable report. See our testing and correction policy.

Copied