if you use zenfire or rithmic as datafeed, use R | Trader platform for bracket and oco orders being stored on the server

Futures Operator 

According to Optimus' site, Rithmic does server side OCO through their R Trader platform: Server Side OCO and Contingent Orders for Futures Futures Trading Blog for Independent Self-Directed Traders and System Traders Not sure how it compares to the example above in regards to needing the initial order to be filled before its protected.

Received clarification on this from Rithmic:

"When you submit a bracket order, the oco portion is submitted along with the entry so once accepted by the system, all parts reside on the system. the oco will get submitted to the exchange as appropriate whether or not your r | trader session is connected."