Network Services

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The HPDU supports the following network communication services. All TCP ports for supported services are set to standard ports.

Network Service	Description
HTTP HTTPS	Enable or disable access to the HPDU web interface. HTTPS uses Transport Layer Security (TLS) technology to encrypt all traffic to and from the HPDU so it is a more secure protocol than HTTP. The HPDU supports TLS 1.0, 1.1 and 1.2. By default, any access to the HPDU through HTTP is automatically redirected to HTTPS. You can disable this redirection if needed.
SNMP	Allows the SNMP manager to retrieve and control the power status of each outlet. Enable or disable SNMP communication between an SNMP manager and the HPDU device.
SMTP Server	Sends alerts or event messages to an administrator by email.
SSH	Enable or disable access to the HPDU command line interface (default) or change the TCP port, or set a password or public key for login over the SSH connection.
Telnet	Enable or disable access to the HPDU command line interface or change the TCP port. By default, Telnet is disabled because it communicates openly and is not secure.
Modbus	Enable or disable the Modbus/TCP access to the HPDU, set it to the read-only mode, or change the TCP port.
Service Advertising	The HPDU advertises all enabled services that are reachable using the IP network. The protocols are MDNS (Multicast DNS) and Link-Local Multicast Name Resolution (LLMNR). The advertised services are discovered by clients that have implemented MDNS and LLMNR. By default,both protocols are enabled. The advertised services include: HTTP HTTPS Telnet SSH Modbus json-rpc SNMP Enables Link-Local Multicast Name Resolution (LLMNR) and MDNS, which are required for resolving APIPA host names. Supports both IPv4 and IPv6 protocols.