Is port 751 (Kerberos Master) dangerous?

Port 751 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 751 be open on my firewall?

No, port 751 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 751 use?

Port 751 (Kerberos Master) uses the TCP/UDP transport protocol and falls under the Security & VPN category.

:751 (TCP/UDP)

Kerberos Master

Critical 风险

TCP/UDP — Security & VPN

端口概览

端口号 751

服务名称 Kerberos Master

传输协议 TCP/UDP

类别 Security & VPN

安全风险 Critical

端口范围知名端口 (0-1023)

什么是端口 751?

Kerberos v4 master database administration service. Relies on cryptographically broken DES encryption. Should be disabled in all environments.

TCP/UDP Security & VPN

安全注意事项

端口751（Kerberos Master）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）。

Kerberos Master

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端口概览

什么是端口 751?

安全注意事项

相关端口 — Security & VPN

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