Is port 515 (LPD) dangerous?

Port 515 is classified as high risk. It is a common target for automated scanning and brute-force attacks. Restrict access to trusted IPs if exposure is necessary.

Should port 515 be open on my firewall?

Port 515 should only be open with strict firewall rules whitelisting trusted IP addresses. Enable rate limiting and intrusion detection systems.

What transport protocol does port 515 use?

Port 515 (LPD) uses the TCP transport protocol and falls under the System & Infrastructure category.

:515 (TCP)

LPD

High 风险

TCP — System & Infrastructure

端口概览

端口号 515

服务名称 LPD

传输协议 TCP

类别 System & Infrastructure

安全风险 High

端口范围知名端口 (0-1023)

什么是端口 515?

Port 515 is assigned to LPD/LPR (Line Printer Daemon), the traditional Unix printing protocol defined in RFC 1179. Still widely supported by network printers. No authentication.

TCP System & Infrastructure 常用

安全注意事项

端口515（LPD）被归类为高风险。此端口是自动扫描和暴力破解攻击的常见目标。如必须暴露，请将访问限制为已知IP地址。

建议：使用防火墙规则将可信IP列入白名单。启用速率限制和入侵检测。

LPD

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端口概览

什么是端口 515?

安全注意事项

相关端口 — System & Infrastructure

相关术语