Market Data Request Reject (35=Y)

The server sends MarketDataRequestReject (35=Y) to the client over TLS/TCP. This is not an HTTP response.

Sent when a MarketDataRequest cannot be fulfilled due to invalid symbol, duplicate request ID, rate limits, or other constraints.

Error Codes (Tag 281):

• 0: Unknown symbol. Product not available or trading halted
• 1: Duplicate MDReqID. This request ID is already in use; choose a unique ID
• 2: Insufficient Bandwidth. Too many active subscriptions or rate limit exceeded
• 4: Unsupported SubscriptionRequestType (263). Must be 0, 1, or 2
• 5: Unsupported MarketDepth (264). Must be 0–100
• 6: Unsupported MDUpdateType (265). Must be 0 (full) or 1 (incremental)
• 8: Unsupported MDEntryType. Trade data not yet supported; use only 0 (Bid) and 1 (Offer)
• 10: Unsupported Scope. Market data unavailable for this symbol

Fields:

• mdReqID (262): Echoed from the original request. Use this to correlate with your subscription
• mdReqRejReason (281): Numeric code (see above)
• text (58): Human-readable description (present when non-empty)