1. Read the documentation

    Quick start, concepts and the command-line reference answer most questions in a minute.

    PortWho docs
  2. Check troubleshooting and FAQ

    Known limitations, and the reasons behind "access denied", "exited" or signature states.

    Troubleshooting
  3. Write to us

    For anything the documentation does not answer. Include the version and, where relevant, the JSON output.

    kontakt@redlinesystems.de

What helps us help you

  • Product name and version (portwho --version).
  • Windows version and whether you ran the tool elevated.
  • The exact command and the output, ideally --json for anything about a specific port.
  • What you expected to happen instead.

Security issues have their own reporting process; please never post vulnerability details in public.

Documentation by product

Support is free

The tools are free, and so is help with them. There are no paid support plans, priority tiers or subscriptions, and nothing on this site is sold.