# WHATPORT(3351)

## NAME

port 3351 — Btrieve / Actian Zen — The Btrieve MicroKernel database engine port, still carrying Actian Zen and Pervasive PSQL traffic.

Protocol: TCP  
IANA registry

## DESCRIPTION

IANA registers 3351 as `btrieve`, and it remains the listening port of the MicroKernel Engine in Pervasive PSQL and its successor Actian Zen — the modern descendants of Btrieve. Clients reach databases through it directly, including URIs of the form `btrv://servername:port/database`, and Actian's documentation recommends not changing the assignment. It turns up wherever vertical-market Windows applications ship an embedded Zen database: point-of-sale, dental and veterinary practice software, small ERP systems. An open 3351 means a business application's data files are reachable over the network.

## EXPOSURE

**Do not expose.** It is a database engine port with the application's records behind it and no transport encryption by default; keep it on the LAN and reach it over a VPN.

## CHECK

```sh
nc -vz TARGET 3351
```

## SEE ALSO

- docs — [Actian Zen — Setting Up Network Communications for Clients](https://docs.actian.com/zen/v16/getstart/clientconf.htm) (docs.actian.com)
- iana — [IANA Service Name and Transport Protocol Port Number Registry](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml) (iana.org)

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HTML: <https://whatport.net/3351/> · JSON: <https://whatport.net/3351.json> · full dataset: <https://whatport.net/ports.json>