localhost:8384: what runs on it and how to open it
Port 8384 is the Syncthing web page. How to open it and keep it private.
Open this address: http://localhost:8384This opens on your own computer. It only works if the program is running.
localhost:8384 is the Syncthing web page. It listens on your own computer only, unless you change the setting, and it should have a password if you open it up.
What runs on localhost:8384
- Syncthing file sync, web page on 127.0.0.1:8384
Commands to start and test port 8384
http://127.0.0.1:8384curl -I http://127.0.0.1:8384Find what is using port 8384
Run these in a terminal on your computer. Nothing is sent to this site.
If localhost:8384 will not open
- The page is not reachable from another computer
- By default it listens only on 127.0.0.1. Set a GUI password before you change this, because the page controls your synced folders.
- Port 8384 is already in use
- Another program is on this port. Find it with the tool below and stop it, or start yours on another port.
- This site can’t be reached (ERR_CONNECTION_REFUSED)
- The program is not running. Start it and keep that terminal open. See the full checklist.
- Works on your computer, not on your phone
- Start the server on all network addresses and use your computer’s IP address. See how to open localhost from your phone.
Other ports like 8384
| Port | Usually used by |
|---|---|
| localhost:11434 | Ollama (AI models) |
| localhost:5601 | Kibana |
| localhost:11501 | Not a standard port: check what is using it |
| localhost:9200 | Elasticsearch |
| localhost:5672 | RabbitMQ |
| localhost:15672 | RabbitMQ admin page |
| localhost:9090 | Prometheus |
Questions about localhost:8384
- Which port syncs the files?
- Syncthing uses port 22000 for file transfer. The web page is separate, on 8384.
- Is localhost:8384 safe?
- Yes, as long as it stays on localhost. Only your own computer can reach it. It becomes reachable from other devices only if you start the program on 0.0.0.0 or your computer's IP address. Do not put development or admin tools on the public internet.
- Can I use a different port instead of 8384?
- Yes. Most programs let you choose the port with a setting or a command option. Pick a free port above 1024 and open that number instead.
- How do I check what is using port 8384?
- Use the port checker on this page. It shows the command for Windows, macOS and Linux and does not send anything to this site.
- Can I open localhost:8384 from my phone?
- Yes, if both are on the same Wi-Fi. Start the program so it listens on all addresses, then open your computer's IP address with the port on the phone. A firewall on the computer can still block it.
Free tools that help
- Common ports listSearch a list of common TCP and UDP port numbers: SSH 22, HTTP 80, HTTPS 443, MySQL 3306, PostgreSQL 5432 and more, with dev server ports.