Is port 513 (rlogin) dangerous?

Port 513 is classified as critical risk and should not be exposed to the public internet. It transmits data without encryption, making it vulnerable to eavesdropping and credential theft.

Should port 513 be open on my firewall?

No, port 513 should not be open to the public internet. Block it at the firewall and use encrypted alternatives such as SSH, SFTP, or HTTPS instead.

What transport protocol does port 513 use?

Port 513 (rlogin) uses the TCP transport protocol and falls under the Remote Access category.

:513 (TCP)

rlogin

Critical 风险

TCP — Remote Access

端口概览

端口号 513

服务名称 rlogin

传输协议 TCP

类别 Remote Access

安全风险 Critical

端口范围知名端口 (0-1023)

什么是端口 513?

Port 513 is assigned to rlogin, which relies on a deeply flawed IP-based trust model with no encryption. Critical security vulnerability.

TCP Remote Access

安全注意事项

端口513（rlogin）被归类为严重风险。此端口不应暴露在公网上。该服务在未加密的情况下传输数据，容易受到窃听、凭据窃取和中间人攻击。

建议：在防火墙处封锁此端口。改用加密替代方案（SSH、SFTP、HTTPS）。

rlogin

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端口概览

什么是端口 513?

安全注意事项

相关端口 — Remote Access

相关术语