Port 27017 — 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: 2026-09-05

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