MQL5 trade server return code
MQL5 error 10017 is TRADE_RETCODE_TRADE_DISABLED, the official trade server return code for trading disabled by the server. Confirm that the account and server allow trading, then check the symbol trade mode and session. Code cannot override a broker or account restriction; use an account and symbol for which the server permits the requested operation. Read MqlTradeResult.retcode after OrderSend because a successful function return does not by itself mean that the order was executed.
Open the Coding Agent and choose MQL5 from the language menu.
bool TradingContextAllowsEA(const string symbol)
{
bool account_allowed=(bool)AccountInfoInteger(ACCOUNT_TRADE_ALLOWED);
bool expert_allowed=(bool)AccountInfoInteger(ACCOUNT_TRADE_EXPERT);
long symbol_mode=SymbolInfoInteger(symbol,SYMBOL_TRADE_MODE);
PrintFormat("account=%s expert=%s symbol_mode=%d",
account_allowed ? "on" : "off",
expert_allowed ? "on" : "off",
symbol_mode);
return account_allowed && expert_allowed &&
symbol_mode!=SYMBOL_TRADE_MODE_DISABLED;
}The code belongs to MqlTradeResult.retcode, not to the compiler error list and not necessarily to GetLastError. The trade server uses 10017 to report trading disabled by the server.
Keep the request, the boolean returned by OrderSend, result.retcode, result.comment, and the symbol properties in the same log record. That separates a client-side request failure from a server-side rejection.
Use the smallest failing order and compare every broker-sensitive value with the current symbol and account. Do not hide the error by retrying unchanged input.
Confirm that the account and server allow trading, then check the symbol trade mode and session. Code cannot override a broker or account restriction; use an account and symbol for which the server permits the requested operation.
Run OrderCheck with the completed request, log its retcode and comment, then send only if the check is acceptable. OrderCheck improves diagnostics but does not guarantee execution.
This guard records account and symbol permissions before the request. A server can still reject trading for a condition not represented by these local flags.
A valid request can still be rejected or filled differently by the trade server. Check the returned retcode, test with the broker symbol and account, and review risk before any live order.
bool TradingContextAllowsEA(const string symbol)
{
bool account_allowed=(bool)AccountInfoInteger(ACCOUNT_TRADE_ALLOWED);
bool expert_allowed=(bool)AccountInfoInteger(ACCOUNT_TRADE_EXPERT);
long symbol_mode=SymbolInfoInteger(symbol,SYMBOL_TRADE_MODE);
PrintFormat("account=%s expert=%s symbol_mode=%d",
account_allowed ? "on" : "off",
expert_allowed ? "on" : "off",
symbol_mode);
return account_allowed && expert_allowed &&
symbol_mode!=SYMBOL_TRADE_MODE_DISABLED;
}Pineify can generate or revise MQL5 source and use MQL5 compilation diagnostics during the coding workflow. Keep the exact error, source location, program type, and intended behavior in the request so the change remains reviewable.
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Log the OrderSend return value, result.retcode, result.comment, symbol, order type, volume, price, stops, and filling mode. Confirm that the retcode is 10017.
Query the symbol and account immediately before building the request. Broker constraints can differ between symbols and sessions.
Confirm that the account and server allow trading, then check the symbol trade mode and session. Code cannot override a broker or account restriction; use an account and symbol for which the server permits the requested operation.
Call OrderCheck, submit the corrected request, then reproduce it in Strategy Tester and a demo account before considering live use.
It is TRADE_RETCODE_TRADE_DISABLED, the official MQL5 trade server return code for trading disabled by the server.
Treat it as a trade server return code when it appears in MqlTradeResult.retcode. GetLastError reports the terminal runtime error layer, which is a separate diagnostic channel.
No. The official OrderSend reference says true means the request passed basic checks and was accepted for processing. Inspect result.retcode and subsequent trade events to determine the outcome.
Last verified against the linked official references on . Compile and test the final source in the MetaTrader 5 build, broker, symbol, and account environment you plan to use.
Provide the exact diagnostic and intended behavior, inspect the generated change, compile it, and verify it in your MT5 test environment.
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