The plugin for MetaTrader5 works fine on the test server and for clients, but does not work on the local meta. Why?

Question

Electronic commerce

We are writing a plugin for the MetaTrader 5 platform using the server API.
For some reason, the plugin cannot open trades on accounts on the local server of one employee, despite the fact that trades open normally on our test server and on the clients' servers.
The response from the server 10013 to everything is an invalid request. Why then is it "correct" on other servers? (.-.)
We tried to reinstall the metak server, and update the metak to the latest version and monitor what gets into requests - in general, there were no differences from other servers. But the plugin still doesn't open deals...
At the same time, you can safely use the "default" functions of the metac itself from its terminals - "manually" open accounts, orders, deals, close them, delete them - whatever. Communication between servers, on broad gulls, normal. To log in, use an admin account with all rights.

Answer 1

The spirits of the underworld are trying to protect you from this, which is why the plugin does not work