Product manual

Appendix C. NL200 Settings

C.5 TLS Proxy Server Tab

TLS Proxy Server Enabled

Enable/Disable the TLS Proxy Server. When doing TLS proxy communications,

the device's TLS server maintains a secure TLS connection with a remote TLS

client and forwards information onto a datalogger using a standard TCP

connection. TCP ports and physical connections are configured below.

If the TLS Proxy Server is Enabled and a datalogger is connected

to the CS I/O port then the datalogger will load its TCP stack in

case it is required to do TCP communications. Running the TCP

stack causes the datalogger to use more memory, leaving less for

final storage etc. So if TCP/TLS server capability is not required

the TLS Proxy Server should be left disabled.

NOTE

TLS Proxy Server Port Number

When doing TLS Proxy communications the NL200 TLS server maintains a

secure connection with a remote client. If the 'TLS Proxy Forward Physical

Port' is specified to be the CS I/O port the NL200 will then open a TCP

connection with the logger over the CS I/O port and do unecrypted data

transfer with the logger. If the 'TLS Proxy Forward Physical Port' is specified

to be the Ethernet port then the NL200 will open the TCP connection over

Ethernet on the 'TLS Proxy Forward IP Address.'

In order to communicate with the NL200 TLS server, the client application

must open a socket to that server. The socket of the NL200 TLS server is

uniquely identified by the IP address and a port number. This entry is where

the port number of the NL200 TLS server is set.

The TLS client needs to be set to communicate on this port number. If secure

communications come in on the 'Secure Proxy Server Port Number' the NL200

will attempt to open a TCP connection to the datalogger on the 'Secure Proxy

Forward Port Number'. Also, regardless of this setting, the NL200 Secure

Proxy Server will always listen on the secure HTTP (HTTPS) port number

443. If a secure connection is established on this port, the NL200 will attempt

to communicate to the datalogger on the HTTP port 80.

(range 1..65535)

TLS Proxy Forward Physical Port