Configure TCP/IP Services
The TCP/IP Services section allows you to enable communication services on the SCADAPack x70 device.
You can enable the following services:
DNP3/IP communications are enabled on the SCADAPack x70 device and cannot be disabled.
When the box is checked, the Telnet server in the device is enabled and multiple users can remotely connect to the device command line.
The SCADAPack x70 device includes a built-in Telnet server that you can connect to using Telnet client software. The Telnet server on the device:
- Opens a Telnet server listener socket on TCP port number 23 and supports 5 simultaneous Telnet sessions. Connection requests beyond this limit are rejected. The 5 Telnet connections can use any combination of USB Device port, serial ports configured for PPP/TCPIP operation and Ethernet ports.
- Supports 1 diagnostics session. If you try to run 2 or more diagnostics sessions — for example through a serial port configured for Command Line operation and through a Telnet session on an Ethernet port — the second session connection to the diagnostic stream session is rejected.
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Disconnects the Telnet client after five consecutive minutes of inactivity.
When the box is checked, the FTP server in the device is enabled and multiple users can remotely access the file system on the device using FTP client software.
The FTP server on the device opens an FTP server listener socket on TCP port number 21 and supports simultaneous connections from up to 5 FTP clients. Connection requests beyond this limit are rejected. The 5 FTP client connections can use any combination of USB Device port, serial ports configured for PPP/TCPIP operation and Ethernet ports.
The FTP server in the SCADAPack x70 device disconnects the FTP client after five consecutive minutes of inactivity. When this occurs, your FTP client may receive a message similar to the following if it attempts to access the connection after the inactivity timeout:
Connection closed by remote host
The FTP server in the device does not support FTP firewall Passive mode. Before you try to transfer data from the device to the FTP client, switch off Passive mode in the FTP client. For more information see the user manual or online help for your FTP client software.
To maintain device performance, do not use FTP to transfer more than the recommended maximum number of 500 files per file system directory at one time.
INSECURE COMMUNICATIONS
The Telnet and FTP server on the SCADAPack x70 device can be insecure if they are not externally secured. This is because TCP/IP application protocols transmit data, including user names and passwords, in clear text.
It is strongly recommended that the Telnet and / or FTP server on the device be disabled when not in use. Leaving the either server enabled can create a security vulnerability if the remote IP connection to the device is not secured.