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IPFYI
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751

Kerberos Master

Critical Risk

TCP/UDP — Security & VPN

Port Overview

Port Number 751
Service Name Kerberos Master
Transport Protocol TCP/UDP
Category Security & VPN
Security Risk Critical
Port Range Well-Known (0-1023)

What is Port 751?

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

TCP/UDP Security & VPN

Security Considerations

Port 751 (Kerberos Master) is classified as critical risk. This port should not be exposed to the public internet. The service transmits data without encryption, making it vulnerable to eavesdropping, credential theft, and man-in-the-middle attacks.

Recommendation: Block this port at the firewall. Use encrypted alternatives (SSH, SFTP, HTTPS) instead.

Related Ports — Security & VPN

49 TACACS 65 TACACS-DS 88 Kerberos 90 DNSIX Security 370 codaauth2 389 LDAP 464 Kerberos Change Password 500 IKE/ISAKMP
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