If you see the "No connection" error, please follow the steps:

1. Make sure the correct server is selected. Enter its DNS address. 

2. Make sure the password entered is correct for the trading account you are connecting to.

3. Please check that the terminal is running with administrator rights. You can run the terminal as an administrator by right-clicking the terminal icon and selecting "Run as administrator."

If these steps do not help, please try temporarily disabling your antivirus and firewall.