If the IB servers are down then whether your order is still active or not depends on what order you used. If you used "native" orders like Limit and Stop-Limit for the ES on Globex, then these are held at the exchange and they would still be active even if IB servers went down or not.
From IB's website:
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US Futures Stop Order and Stop-Limit Order Handling Rules
Please note the following rules for stop orders and stop-limit orders on the US futures exchanges.
CBOT (A/C/E)
Stop Orders: Stop orders are native to A/C/E and can be placed at anytime during trading hours.
Stop-Limit Orders: Stop-Limit orders are not supported by A/C/E. Interactive Brokers provides customers with simulated stop-limit orders. Simulated Stop-Limit orders can be placed at anytime during trading hours.
CME (GLOBEX)
Stop Orders: Stop orders are not supported by GLOBEX. Interactive Brokers provides customers with simulated stop orders. Simulated stop orders will only trigger during regular trading hours unless configured by the customer. Regular trading hours are from 9:30 a.m. to 4:00 p.m. New York time. In order to be able to place stop orders outside of regular trading hours, go to the TWS, select Configure >> Order >> Stop Trigger Method. Under âGLOBEX Orders Time Restrictionâ you may choose to allow stop orders to trigger outside of regular trading hours.
Stop-Limit Orders: Stop-Limit orders are
native to GLOBEX and can be placed at anytime during trading hours. Please note the following restrictions placed by GLOBEX.
For Sell Stop-Limit Orders, the limit price must be <= stop price (aux. price)
For Buy Stop-Limit Orders, the limit price must be >= stop price (aux. price)
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nitro
Quote from pspr:
IB holds stop orders on their servers until the stop price is hit then IB sends a simulated market order to Globex. This can cause a problem if the IB servers are down, busy or the market is fast. Also, IB allows different preferences in their software for triggering a stop order.
However, stop limit orders are sent immediately to Globex and reside on the Globex system.
I only use stop limit orders after having some problems with IB and thier stop order process. Once, Globex sent IB some erroneous price quotes triggering my stop and many others even though the market never traded at the stop price. Neither Globex nor IB would bust those trades and us traders had to accept being kicked out of the market. Naturally, the market made a big move in my direction right after that.
Wally