:391
(TCP/UDP)
SynOptics-SNMP
Low RiskTCP/UDP — System & Infrastructure
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Port Overview
Port Number
391
Service Name
SynOptics-SNMP
Transport Protocol
TCP/UDP
Category
System & Infrastructure
Security Risk
Low
Port Range
Well-Known (0-1023)
What is Port 391?
SynOptics SNMP Relay. SNMP relay protocol for SynOptics (now Nortel/Extreme) network management.
TCP/UDP
System & Infrastructure
Security Considerations
Port 391 (SynOptics-SNMP) is classified as low risk. This service uses encryption or has a minimal attack surface, making it relatively safe to expose.
Recommendation: Standard security practices apply. Keep software updated and monitor access.