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MetaTrader error codes / MT5 Python package errors

MT5 Python error -10001: IPC send failed (RES_E_INTERNAL_FAIL_SEND)

Python couldn't pass the command to the terminal. The terminal is likely closed or stuck; reconnect before anything else.

-10001RES_E_INTERNAL_FAIL_SEND
Check firstSafe to retry?
MaybeCould it have executed?

What it means

You see this code in mt5.last_error() in Python, after a package call returns None or False.

The package tried to hand the call over to the terminal and the handover failed. The terminal didn't get the command.

It usually means the terminal went away between two calls.

Common causes

  • The terminal was closed or crashed.
  • The terminal is frozen and not reading commands.
  • The connection was shut down by another part of your program.

How to fix it

  • Reconnect with mt5.shutdown() and mt5.initialize().
  • Watch the terminal process and restart it if it dies.
  • After reconnecting, read positions and orders before trading again.

Example in Python:

import MetaTrader5 as mt5

r = mt5.order_send(request)
if r is None and mt5.last_error()[0] == -10001:
    mt5.shutdown()
    if mt5.initialize():
        # The command most likely never arrived, but look before resending.
        print(mt5.positions_get(symbol=request["symbol"]))

Is it safe to retry?

Check first. Usually yes after reconnecting, but read the account first when the call was a trade.

Could the order have executed?

Maybe. Unlikely, because the command didn't reach the terminal. You can't see that from Python for certain, so check.

Without the Python package

With Tickwire your code calls a REST API from any operating system, so this package error doesn't come up. See the MT5 Python API page.

Related MT5 Python functions

All MetaTrader error codes

All MetaTrader5 Python functions

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Clear trade outcomes, idempotent orders and an audit log. Read the error reference or the quickstart.

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