Internet connection through a proxy server may be the reason why your device fails to connect to the MT4 platform.
If the system requires you to enter details of the proxy server settings (a popup window will appear) when installing or downloading the platform, take one of the following steps:
- Turn off antivirus protection. You can do this in the settings of your antivirus program.
- Disable firewall. Open the Start menu on your device and choose Control Panel. Then, select the System and Security section and find a tab that contains Firewall. You should then select the Turn Firewall Off checkbox.
- Run the installer as administrator.
- Disable the VPN connection if it is running on your device.