# WHATPORT(2383)

## NAME

port 2383 — SQL Server Analysis Services — The default instance of SQL Server Analysis Services — the OLAP/tabular engine behind Excel and Power BI cubes.

Protocol: TCP  
IANA: ms-olap4

## DESCRIPTION

Microsoft documents TCP 2383 as the port a default SQL Server Analysis Services instance listens on, and the port a failover-clustered instance always uses regardless of naming. Named instances take a dynamic port instead and rely on SQL Server Browser on TCP 2382 to redirect clients. The listening port comes from the Port setting in msmdsrv.ini (0 means "use 2383 or a dynamic port"), and SSAS uses TCP only — no UDP. On a scan it marks a BI server holding aggregated business data.

## EXPOSURE

**Do not expose.** An analytical database engine with its own security model and no reason to face the internet — keep it behind the firewall and reach it over a VPN or a gateway service.

## CHECK

```sh
nc -vz TARGET 2383
```

## SEE ALSO

- docs — [Microsoft Learn — Configure the Windows Firewall to Allow Analysis Services Access](https://learn.microsoft.com/en-us/analysis-services/instances/configure-the-windows-firewall-to-allow-analysis-services-access) (learn.microsoft.com)
- iana — [IANA Service Name and Transport Protocol Port Number Registry — 2383 (ms-olap4)](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=2383) (iana.org)

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