[Error:4752-10027] Trading by Expert Advisors prohibited : Autotrading disabled by client terminal

Introduction

Have you seen this message?

Error: 4752-10027, Trade request sending failed: Trading by EA prohibited. Reason: Autotrading disabled by client terminal

This error happens when MetaTrader blocks automated trading. Even if your EA (like TradeAdapter) is configured correctly, the platform rejects all orders if autotrading is disabled globally or inside the EA settings.

1. Why does this error happen?

The most common reasons are:

• Global AutoTrading disabled – the green/red button in the top toolbar (Algo Trading in MT5 or AutoTrading in MT4) is disabled.
• Platform settings – in Tools → Options → Expert Advisors, the option Allow algorithmic trading is not checked.
• EA permissions – the option Allow algo trading is not enabled in the EA properties.
• Broker/account restrictions – some brokers or prop firm accounts do not allow automated trading at all.

2. How to fix it step by step

Step 1 – Enable AutoTrading globally

In the MetaTrader toolbar, make sure the Algo Trading button is green (enabled). If it’s red, click it to activate.

Step 2 – Enable algorithmic trading in platform settings

1. Go to Tools → Options.
2. Open the Expert Advisors tab.
3. Check Allow algorithmic trading.
4. Click OK to save.

Step 3 – Allow trading in EA properties

1. Right-click the chart where TradeAdapter EA is attached → Expert Advisors → Properties.
2. In the Common tab, check:
   • Allow Algo Trading
3. Click OK to save.

3. Conclusion

This error indicates that MetaTrader itself is blocking automated trading, not a malfunction in TradeAdapter.

✅ In most cases, the solution is simple: make sure Algo Trading (AutoTrading) is enabled globally, check Allow algorithmic trading under Tools → Options, and confirm that the EA properties have Allow live trading activated.

❌ However, if you have followed these steps and the error persists, it usually means your broker or account type has restrictions (common in prop firm accounts where EA trading is disabled). In that case, the only fix is to trade on an account that allows automated strategies.

👉 Always double-check both the platform settings and your broker’s policy. Once the restrictions are lifted or properly configured, TradeAdapter will work without issues.