A proxy server may be needed when a stream of data needs forwarded through an intermediate level in the network, such as in the Purdue Model shown below where there is no direct path from Level 3 to Level 4.

The proxy consists of a Receiver and Sender service. The Receiver service accepts incoming data streams from other Collector/Sender's and places them back in the local Sender to be forwarded on to other Receiver/Historian's. Using a local Sender service, the proxy has the ability to log the data to a local historian and/or multiple remote historians.

The proxy is primarily a Receiver configuration, inasmuch, any Receiver has the potential of also becoming a proxy to forward data onward.

Configuration

The following configuration is solely for a proxy set up. It is possible that other services may need installed if wishing to utilize more Canary services on the same machine. At a minimum though, the proxy will need the Sender and Receiver service.

1. Run the Canary System Installer and select the 'Store & Forward' checkbox. This will install the Canary Admin Service, Sender, Receiver, and Canary Admin Client.
2. Once installed, the attached 'proxy.config' file will need placed in the same directory as the CanaryReceiver.exe. By default, this is located in C:\Program Files\Canary\Receiver.
3. Open the file to add/remove/edit the <historian> parameters. If wishing to log data to a local historian, use 'localhost'. Any number of additional historians can be added to the file.
4. Restart the Receiver service. A service restart is needed any time changes are made to the proxy.config file.