Is port 750 (Kerberos v4) dangerous?

Port 750 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 750 be open on my firewall?

No, port 750 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 750 use?

Port 750 (Kerberos v4) uses the UDP transport protocol and falls under the Security & VPN category.

:750 (UDP)

Kerberos v4

Critical Risk

UDP — Security & VPN

Port Overview

Port Number 750

Service Name Kerberos v4

Transport Protocol UDP

Category Security & VPN

Security Risk Critical

Port Range Well-Known (0-1023)

What is Port 750?

Kerberos version 4 authentication service. Has known cryptographic weaknesses including DES-only encryption. Superseded by Kerberos v5 on port 88. Should be disabled.

UDP Security & VPN

Security Considerations

Port 750 (Kerberos v4) 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

31 MSG-AUTH 48 Auditd 49 TACACS 56 XNS-AUTH 62 ACA Services 65 TACACS-DS 88 Kerberos 90 DNSIX Security

Related Terms

SSL/TLS Certificate DDoS DNS Spoofing Encryption Firewall HTTPS