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Date/Time: Sat, 28 Feb 2026 03:05:47 +0000



Post From: DTC JSON Compact – External Client Market Data Request Behavior

[2026-02-27 20:16:47]
UserFXGroup - Posts: 1
Hi,

I am running Sierra Chart connected to CQG WebAPI (live). The DTC Protocol Server is enabled with JSON Compact encoding. Please note, I am connecting from an external Python client via DTC.

When connecting to:

Trading Port (11099) – connection remains stable

Historical Data Port (11098) – connection is closed after sending a Market Data Snapshot request (Type 101)

Questions:

Is a SecurityDefinitionForSymbolRequest required before sending a Market Data Snapshot when using JSON Compact?

Is real-time market data via DTC supported when Sierra is connected to CQG WebAPI?

Is there a required message sequence for market data requests on port 11098 from an external client?

Thank you!