# WHATPORT(6901)

## NAME

port 6901 — KasmVNC (IANA: jetstream) — In practice a KasmVNC browser desktop; on paper, Novell's Jetstream messaging protocol.

Protocol: TCP  
IANA registry

## DESCRIPTION

IANA registered 6901/tcp as "jetstream" (Novell Jetstream messaging protocol) in 2010, but that is not what you find on a modern scan. KasmVNC and the Kasm Workspaces container images publish their web desktop on 6901 — the documented run line is `docker run -p 6901:6901 kasmweb/firefox` and the desktop is then reachable at https://host:6901 with a container user such as kasm_user. Kasm's own fixed-infrastructure docs use the same port when registering a standalone KasmVNC server. Seeing it open means someone is running a browser-accessible remote desktop.

## EXPOSURE

**Do not expose.** It is a full remote desktop, and the stock container images ship with well-known default credentials; publish it through the Kasm gateway or a reverse proxy with real authentication, not directly.

## CHECK

```sh
curl -kI https://TARGET:6901/
```

## SEE ALSO

- source — [KasmVNC source repository](https://github.com/kasmtech/KasmVNC) (github.com)
- source — [Kasm workspaces-images — manual container deployment on 6901](https://github.com/kasmtech/workspaces-images) (github.com)
- docs — [Kasm Workspaces — Fixed Infrastructure (KasmVNC on port 6901)](https://www.kasmweb.com/docs/latest/how_to/fixed_infrastructure.html) (kasmweb.com)
- iana — [IANA Service Name and Transport Protocol Port Number Registry — 6901](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=6901) (iana.org)

---

HTML: <https://whatport.net/6901/> · JSON: <https://whatport.net/6901.json> · full dataset: <https://whatport.net/ports.json>