Is port 87 (ttylink / link) dangerous?

Port 87 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 87 be open on my firewall?

Port 87 is generally safe to have open. Apply standard security practices: keep software updated and monitor access logs.

What transport protocol does port 87 use?

Port 87 (ttylink / link) uses the TCP transport protocol and falls under the Messaging category.

:87 (TCP)

ttylink / link

Low 风险

TCP — Messaging

端口概览

端口号 87

服务名称 ttylink / link

传输协议 TCP

类别 Messaging

安全风险 Low

端口范围知名端口 (0-1023)

什么是端口 87?

Port 87 (also called 'link') was used for terminal-to-terminal chat on UNIX systems. It predates modern messaging systems and was common in 1980s UNIX environments. It is entirely obsolete.

TCP Messaging

安全注意事项

端口87（ttylink / link）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。

ttylink / link

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端口概览

什么是端口 87?

安全注意事项

相关端口 — Messaging

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