Manual v1.7 – Nov 2017 © Utilivista Ltd. 2017 40
C.2 - Required TCP or UDP Ports
They may need to be unblocked by a firewall.
The following TCP or UDP ports will be required, if the specified functionality is used. Port numbers
shown with an asterisk can be changed in the settings for that functionality.
Functionality
TCP Ports
UDP Ports
WAN, Inbound
FTP of CSV files (unless passive
mode)
20
WAN, Outbound
Internet Time (NTP)
123
Email of CSV files
25*
FTP / SFTP of CSV files
21 or 22
Automatic Firmware Upgrades
80 or 443
Remote Access
80 or 443, 22
LAN, Inbound
All configuration pages
80
Modbus TCP, gateway as Slave
1502*
LAN, Outbound
Local Time Server (NTP)
123
Modbus TCP, gateway as Master
502*