MT5 error 10027: Autotrading disabled by client terminal

Switch Algo Trading on in the toolbar and tick Allow Algo Trading in the EA's properties (Common tab).

Updated 22 October 2026. Runs in your browser; nothing you type is uploaded.

Return code or words from the message

The number after retcode= in MT5's Experts or Journal tab. 41 codes, as MQL5's reference words them.

10027

TRADE_RETCODE_CLIENT_DISABLES_AT

Autotrading disabled by client terminal

Cause and fix for 10027

What MQL5 says

10027 TRADE_RETCODE_CLIENT_DISABLES_AT: Autotrading disabled by client terminal

From MQL5's table of trade server return codes, read 22 October 2026. An Expert Advisor finds it in MqlTradeResult.retcode; the Experts and Journal tabs print it.

What causes it

The Algo Trading button in MT5's toolbar is off, or Allow Algo Trading is unticked in the EA's settings.

The fix in MQL5

Switch Algo Trading on in the toolbar and tick Allow Algo Trading in the EA's properties (Common tab). An EA can check both with TerminalInfoInteger(TERMINAL_TRADE_ALLOWED) and MQLInfoInteger(MQL_TRADE_ALLOWED).

Before

#include <Trade/Trade.mqh>
CTrade trade;

void OnTick()
  {
   trade.Buy(0.10, _Symbol);
  }

After

#include <Trade/Trade.mqh>
CTrade trade;

bool AlgoTradingOn()
  {
   if(!TerminalInfoInteger(TERMINAL_TRADE_ALLOWED))
     {
      Print("Algo Trading is off in the terminal toolbar");
      return(false);
     }
   if(!MQLInfoInteger(MQL_TRADE_ALLOWED))
     {
      Print("Allow Algo Trading is unticked in this EA's settings");
      return(false);
     }
   return(true);
  }

void OnTick()
  {
   if(AlgoTradingOn())
      trade.Buy(0.10, _Symbol);
  }

Both compile in MetaEditor 5 with no errors or warnings. Adapt them to your EA; they were not run against a trade server.

Other MT5 errors

Method and privacy

Method: The constant and the description are MQL5's reference table of trade server return codes, read 22 October 2026. The MQL5 code compiles in MetaEditor 5 with no errors or warnings; it is an example to adapt and was not run against a trade server.

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