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MT5 is connected but orders are rejected: permissions, return codes and actual fills

A trading account shown as “connected” is not necessarily allowed to place orders. The connection may permit balance, position and quote reads while a trade request is denied. This distinction becomes critical when MetaTrader 5 is linked to an authorized bridge or a reporting interface such as Disciply. The purpose of this guide is to identify the stage at which a request fails and to show why an immediate retry can be unsafe. It does not enable automatic trading, change broker restrictions or promise execution of any order.

1. Connection, permission and execution are separate states

A technical connection shows that the terminal and server can communicate. Permission to trade concerns account capabilities, broker restrictions and application settings. Execution is a later result demonstrated by order and deal records. A service should not translate “account connected” into “trading authorized” or “trade completed.” For diagnosis record the account type, server, time, instrument and whether a request was actually transmitted. A successful price read proves none of the later stages. Protect login credentials and account numbers when sharing screenshots or support logs.

2. What the official OrderSend documentation establishes

The MQL5 OrderSend function submits a MqlTradeRequest and provides an MqlTradeResult. Its boolean result alone does not certify that the requested deal was executed. Check the trade return code and, where applicable, the resulting order and deal. A dashboard that says “request accepted” but omits the server status may mislead the user. Transport, validation, order placement and execution are related yet distinct. The original explanation is available in the MQL5 OrderSend reference; use it instead of treating a generic success message as definitive.

3. Retcode 10027: disabled by the client terminal

Code 10027, TRADE_RETCODE_CLIENT_DISABLES_AT, means automated trading has been disabled on the client terminal side. It does not by itself prove that the password is wrong, that the broker's entire service is offline or that account history disappeared. It identifies a local automation permission issue. Before considering a settings change, establish that the account holder intentionally authorized the activity and that it fits the applicable trading rules. Approval displayed in a separate web application does not automatically override MetaTrader's terminal protections. Official list: https://www.mql5.com/en/docs/constants/errorswarnings/enum_trade_return_codes .

4. Retcode 10026: disabled by the server

Code 10026, TRADE_RETCODE_SERVER_DISABLES_AT, is different: the server has disabled automated trading. Changing a client-side switch cannot guarantee removal of a server restriction. The owner may need clarification from the broker or the administrator of a specific trading program. Do not try to circumvent restrictions by switching terminals or accounts. For product designers, this should be represented as an external restriction with a verified explanation, not as a problem that can always be fixed by a single automatic button.

5. Other codes and their different meanings

Code 10017 means trading is disabled; 10018 indicates a closed market; 10019 points to insufficient funds; 10021 reports no usable quote; 10031 reports a server connection problem. An invalid stop level can cause 10016, an invalid price 10015, and an invalid request volume 10014. These require different diagnoses. Telling everyone to enable Algo Trading is not a responsible universal remedy. A good error panel presents the numerical code, plain-language explanation and appropriate checks, without exposing secrets in public logs.

6. Where MetaTrader 5 controls automated trading

MetaTrader's official help places common Expert Advisor settings in the terminal configuration. The general Allow Auto Trading permission can prevent EAs and scripts from placing trades even while they continue to perform analysis. Each Expert Advisor may also have its own setting. Depending on protective options, switching accounts, profiles, chart symbols or timeframes can automatically disable automated execution. Check the intended account and understand the risks before altering the setting. Reference: https://www.metatrader5.com/en/terminal/help/startworking/settings .

7. The sensitive demo-to-live switch

A trader may move from a simulated account to a live account and find automated trading disabled as a safeguard. Such restrictions help prevent an algorithm from unintentionally continuing on another account. A linked service showing the new account is not evidence that MetaTrader's permissions have been reauthorized. Automatically enabling every newly selected account is therefore a bad default. Explicit approval for the specific account and a review of position size and maximum exposure are safer than an always-on global setting.

8. Python API, expert advisors and security protections

MetaTrader distinguishes permissions for EAs from permissions for automated trading through the external Python API. The official help notes that Python automated trading is disabled by default for security. It would be irresponsible to advise users to deactivate every security option blindly. Unknown DLL imports and WebRequest destinations can introduce additional risk. Before approving a bridge, identify the executable, account, service owner, necessary capabilities and a way to revoke access. Use only trusted programs with the minimum permissions needed, and retain an auditable record of account-specific consent.

9. A partial fill is not the same as a rejection

Code 10009 indicates a completed request, whereas 10010 reports partial completion. Code 10008 indicates that an order was placed, which is not necessarily the same as an already-open position. Journal calculations should not translate all three into “trade closed” or “trade opened.” For a partial fill compare requested quantity, filled quantity and the remaining state. Link subsequent deal records to the relevant server order and position. The documentation's distinctions matter when reconciling a trading journal, particularly when fills are split across multiple deals.

10. Why a second click after a timeout can create trouble

When a request times out or the response is lost, the true outcome may be uncertain. It is not always established that the server did nothing. Clicking again immediately could create a second order or conflict with one still being processed. First inspect recent deals, active orders, remaining quantities and the last server event; reconcile the request identifier where available. An honest interface distinguishes “not sent,” “rejected,” “unknown after timeout” and “confirmed executed.” A temporary network failure must not mark an unverified link as fully operational or cause repeated trade submissions.

11. Diagnose without risking real capital

Start with a demo environment and harmless checks, such as verifying the correct server, account and permissions without submitting a live order. Confirm that the symbol exists and the market session is active. Collect the actual numerical retcode and look up the precise description. If the issue involves permissions, inspect the setting and explain the choice rather than silently changing it. Only after informed approval and verification of broker restrictions should explicitly authorized testing be considered. A form in a web app cannot be presumed to accept a native MetaTrader security confirmation on the user's behalf.

12. Trading challenges have their own separate rules

A Disciply Trading Challenge or an evaluation environment may be simulated and operate under rules that differ from a personal account. Check the currently applicable rules for the actual round rather than borrowing rules from another prop firm. Technical order acceptance is not proof that a trade complies with a program's restrictions. To plan exposure, use the relevant contract details and the lot and risk calculator, cross-checking margin, leverage and actual spreads with the broker.

13. What a useful order-error screen should display

A clear error message records the observation time, masked account, instrument, requested action, return code, readable meaning and certainty of execution status. It distinguishes a local permission restriction from a server restriction, missing quotes or a timeout. “Try again” is insufficient if an order may already have filled. A link to the primary MetaTrader reference gives users a way to verify the diagnosis. For a trading journal, the priority is not to create false trades and not to lose genuine fills when connections fail temporarily.

Conclusion: execution must be demonstrated by records

The right question is not simply “is MT5 connected?” It is “was trading permitted, was the request valid, what return code was received and which server-side deal was recorded?” Codes 10027 and 10026 represent different restrictions; 10009, 10010 and 10008 describe different successful or intermediate states. Preserve evidence, avoid blind retries and do not remove protective settings without a documented reason. This guide explains operational safety and is not a recommendation to enable automated trading.