MT5 Python error -10005: IPC timeout (RES_E_INTERNAL_FAIL_TIMEOUT)

The terminal didn't answer in time. At connect time the terminal was slow to start; during order_send the order may have executed.

-10005RES_E_INTERNAL_FAIL_TIMEOUT

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 waited for the terminal and gave up. initialize() and login() take a timeout in milliseconds, 60000 by default.

When it happens during a trade, the terminal may still have acted after Python stopped waiting.

Common causes

A terminal that takes long to start, update or load its history.
A slow or busy machine.
A terminal waiting on a dialog, such as an update prompt.

How to fix it

Start the terminal before your script, and pass a larger timeout if start up is slow.
Close dialogs and let updates finish.
After a timeout on order_send, check positions and deals before resending.

Example in Python:

import MetaTrader5 as mt5

if not mt5.initialize(timeout=120_000):     # two minutes for a slow start
    print(mt5.last_error())                  # (-10005, ...) if it timed out

Is it safe to retry?

Check first. At connect time, yes. After a trade, only once you have checked the account.

Could the order have executed?

Maybe. During order_send, maybe.

How Tickwire handles it

On Tickwire, a trade whose answer is unclear is never sent again with new exposure. A retry with the same Idempotency-Key returns the first result. See idempotency.