Port directory — page 6

Zabbix Agent port for system monitoring agent communication

Zabbix Server port for monitoring server data collection

Ollama AI model service port for local large language model services

RabbitMQ management console port for message queue management

Redis cluster port for distributed cache cluster

Milvus vector database port for vector similarity search

Default port for CockroachDB distributed SQL database

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

MongoDB sharding service port for database shard coordination

MongoDB config service port for sharded cluster configuration

gRPC-Go - gRPC implementation for Go

Hadoop NameNode port for distributed file system management

Reserved port；not used（if the sending process does not prepare to accept reply messages，can be used as source port）

TCP Multiplexer service port for multiplexing multiple TCP connections on a single port

Remote Job Entry service port for remote job submission and management

Echo Protocol service port for network connection testing and diagnostics

Discard Protocol service port for network testing and data discarding

Systemstatus display

Daytime Protocol service port for retrieving system date and time information

Network Status Protocol service port for displaying network connection status information

Quote of the Day Protocol service port for providing daily quotes and message services

Message SendingProtocol

Character Generator Protocol service port for generating test character streams

FTP uses TCP 21 for its control connection. File data travels over a separate connection, so a successful login does not prove transfers will work.