753
Kerberos userreg
High RiskTCP/UDP — Security & VPN
Port Overview
Port Number
753
Service Name
Kerberos userreg
Transport Protocol
TCP/UDP
Category
Security & VPN
Security Risk
High
Port Range
Well-Known (0-1023)
What is Port 753?
Kerberos v4 user registration service. Deprecated and replaced by kadmin on port 749 in Kerberos v5.
TCP/UDP
Security & VPN
Security Considerations
Port 753 (Kerberos userreg) is classified as high risk. This port is a common target for automated scanning and brute-force attacks. If you must expose it, restrict access to known IP addresses.
Recommendation: Use firewall rules to whitelist trusted IPs. Enable rate limiting and intrusion detection.