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Port27017— MongoDB

TCPDatabase

MongoDB mongod and mongos normally default to TCP 27017. Other roles, including shard and configuration servers, can have different defaults.

Registry assignments, software defaults and local listeners are different things. A port number alone does not identify or secure a service.

Configuration and troubleshooting

Inspect startup options or net.port and net.bindIp, then the connection string. For replica sets, verify advertised member addresses as well as the initial endpoint.

Important limitations

Do not expose an unauthenticated database to resolve connectivity. A port test cannot replace protocol, authentication or replica-set health checks.

Read-only checks: run on the server host

Choose the commands for your OS. Check TCP and UDP separately. No result is not a lasting availability guarantee; inspect host and container separately.

Linux

sudo ss -ltnp 'sport = :27017'

macOS

sudo lsof -nP -iTCP:27017 -sTCP:LISTEN

Windows PowerShell

Get-NetTCPConnection -LocalPort 27017 -State Listen

Sources and review

Sources checked on:

This review covers the explanations and sources on this page, not your device or every community software entry below.

Software Using This Port (1 software)

Community software entries: links are references, not individual verification.

MongoDB

Default port for MongoDB database server

Reference link ↗

Usage Suggestions

  • Before using port 27017, please confirm it is not occupied by other services
  • If you encounter port conflicts, consider using other ports or stopping the occupying service

Frequently asked questions

What is port 27017 used for?

Port 27017 sits in the Database category. This page lists the registered purpose and the software commonly associated with it; to see what is actually listening on a specific machine, check the process with ss/netstat.

Is port 27017 TCP or UDP?

The registered protocol on this page is TCP. The same number behaves independently on each protocol: TCP may be listening while UDP is idle, so check them separately.

How do I check if port 27017 is in use?

On Linux: sudo ss -tlnp 'sport = :27017' for an exact port match. On macOS: sudo lsof -nP -iTCP:27017 -sTCP:LISTEN. On Windows PowerShell: Get-NetTCPConnection -LocalPort 27017 -State Listen. A listener counts as confirmed only when you can see the bind address and process name; without root/admin you will not see other users' processes.

Is port 27017 secure? Should I open it in my firewall?

A port number has no inherent security — it depends on whether the listening service is correctly configured and whether it needs exposure at all. Keep loopback/internal-only services firewalled; where public access is required, pair it with source restrictions, VPN or authentication. The caution section on this page lists port-specific risks.

Quick Info

Port
27017
Protocol
TCP
Categories
Database
Usage Status
1 software in use

Related Ports

Port 3306TCP
Port 6379TCP

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