Port 27017 supports MongoDB and MongoDB (UDP reference coverage) across distinct transports. Review each protocol before writing firewall or monitoring policy.
Default MongoDB client and server endpoint.
Applications, administrators, replica-set members, and sharded-cluster components connecting to MongoDB.
Client to server
Never expose an unauthenticated database publicly; require authentication, TLS, least privilege, and network restrictions.
MongoDB (UDP reference coverage) is documented as a network service convention for port 27017 over UDP.
Use this reference entry when identifying or validating systems documented to use 27017/UDP.
Varies
Confirm the listening process and current vendor documentation before permitting traffic; a listed convention does not prove the active service or its security posture.