Is port 561 (monitor) dangerous?

Port 561 is classified as low risk. This service uses encryption or has a minimal attack surface, making it relatively safe to expose with standard security practices.

Should port 561 be open on my firewall?

Port 561 is generally safe to have open. Apply standard security practices: keep software updated and monitor access logs.

What transport protocol does port 561 use?

Port 561 (monitor) uses the UDP transport protocol and falls under the System & Infrastructure category.

:561 (UDP)

monitor

Low 风险

UDP — System & Infrastructure

端口概览

端口号 561

服务名称 monitor

传输协议 UDP

类别 System & Infrastructure

安全风险 Low

端口范围知名端口 (0-1023)

什么是端口 561?

Port 561 is assigned to monitor, for Unix system monitoring data distribution. Completely obsolete.

UDP System & Infrastructure

安全注意事项

端口561（monitor）被归类为低风险。该服务使用加密或攻击面极小，相对安全可以暴露。

建议：应用标准安全实践。保持软件更新并监控访问。

monitor

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端口概览

什么是端口 561?

安全注意事项

相关端口 — System & Infrastructure

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