# WHATPORT(9191)

## NAME

port 9191 — PaperCut admin UI (registered as Sun AppSvr JPDA) — Almost always the PaperCut print-management web console, despite the Java-debugger registration.

Protocol: TCP  
IANA registry

## DESCRIPTION

IANA registered 9191 in 2005 as sun-as-jpda, the Java Platform Debugger Architecture port for Sun's application server, and scanners still print that name. In the field the port belongs to PaperCut NG/MF, whose Application Server serves its admin and end-user web interface on 9191 over HTTP with 9192 as the HTTPS counterpart; print servers and workstation clients also talk to it. A listener on 9191 in an office almost always means a PaperCut server.

## EXPOSURE

**Do not expose.** It is a cleartext HTTP admin console for print accounting, user balances, and server configuration. Use the 9192 HTTPS port and keep both off the public internet; a JPDA debug port would be even worse, since JDWP grants code execution with no authentication.

## CHECK

```sh
curl -sS -m 5 -o /dev/null -w '%{http_code}\n' http://TARGET:9191/
```

## SEE ALSO

- iana — [IANA port registry — 9191 (sun-as-jpda)](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=9191) (iana.org)
- docs — [PaperCut NG/MF — Change the Application Server ports](https://www.papercut.com/help/manuals/ng-mf/common/sys-security-options-change-ports/) (papercut.com)

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