401
UPS
High RiskTCP/UDP — System & Infrastructure
Port Overview
Port Number
401
Service Name
UPS
Transport Protocol
TCP/UDP
Category
System & Infrastructure
Security Risk
High
Port Range
Well-Known (0-1023)
What is Port 401?
Port 401 is assigned to UPS monitoring protocol, used by UPS management software such as Network UPS Tools (NUT). Unauthorized access could manipulate power systems.
TCP/UDP
System & Infrastructure
Commonly Used
Security Considerations
Port 401 (UPS) 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.