What Port 2383 Does
Port 2383 is the default TCP port for SQL Server Analysis Services (SSAS), Microsoft's OLAP (Online Analytical Processing) engine. When a BI tool like Power BI, Excel, or a third-party analytics client needs to query an Analysis Services cube, it connects here.1
Despite the task description, this port is not unassigned. IANA registers it as ms-olap4 — Microsoft OLAP — for both TCP and UDP.2
What OLAP Actually Is
Regular SQL queries ask about rows: "Give me every sale from January." OLAP queries ask about dimensions: "Give me total sales across all time, broken down by region and product category, pre-aggregated so the answer is instant."
Analysis Services sits on top of a relational database and maintains these pre-computed aggregations — called cubes — so that queries that would take minutes against raw data return in milliseconds. Port 2383 carries those queries. It's where companies ask questions about themselves.
The 2382/2383 Pattern
SQL Server Analysis Services uses two ports that work together, mirroring how the regular SQL Server engine uses 1433 and 1434.
| Port | Role |
|---|---|
| 2382 | SQL Server Browser for Analysis Services — redirects requests for named instances to their dynamic ports |
| 2383 | The default instance of Analysis Services — the actual query endpoint |
If you have a default SSAS installation, clients connect directly to port 2383. If you have named instances (multiple independent SSAS installations on one machine), they listen on dynamic ports and the SQL Server Browser on 2382 acts as the directory.1
Who Uses This Port
Port 2383 shows up anywhere Microsoft's BI stack is deployed:
- SQL Server Analysis Services (on-premises, all versions since SQL Server 2000)
- Azure Analysis Services (cloud-hosted SSAS)
- Power BI Premium (uses an internal SSAS engine)
- Any third-party tool connecting to SSAS: Tableau, Excel Power Pivot, SSRS, Cognos, MicroStrategy
How to Check What's Listening
On Windows (the natural habitat of SSAS):
Then look up the process ID (PID) in Task Manager, or:
You should see msmdsrv.exe — the Analysis Services process.
On Linux/Mac (checking a remote Windows host):
Or with nmap:
Firewall Considerations
Windows Firewall does not automatically open port 2383 when Analysis Services is installed — even though SSAS listens on it. Remote connections fail silently until you add an inbound rule explicitly allowing TCP 2383.1
If you're troubleshooting a BI tool that can't reach an SSAS server, the firewall is the first place to look.
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