Bad Request. HTTP Error 400.
Request has not been accepted by the server because of syntax error. The client should correct request and try to access the server again.

Forbidden download. HTTP Error 403.
Access to the requested file is forbidden.

Requested file not found on the server. HTTP Error 404, FTP.
The link points to a non-existent file. There may be two causes for this error: invalid link or the file has been deleted.

URL is too long. Edit URL and restart download. HTTP Error 414.
The server cannot process the request because of a too long URL.

Internal server error. HTTP Error 500.
The server cannot process the client request because of internal error.

The server does not support the functionality required for processing this request. HTTP Error 501.
This action is not supported by the server. The server does not support the functionality required for processing this request.

Bad gateway. HTTP Error 502.
The server acting as a gateway or proxy received a notification about unsuccessful intermediate operation.

Service temporarily unavailable. HTTP Error 503.
The server temporarily cannot process the request due to some technical reasons (maintenance, overload etc.).

NTLM-Proxy authentication failed.
Error occurred when passing authentication on NTLM-Proxy server.

Download error. Error code xxxx.
Received socket error message from operating system.

Download error. Download interrupted.
The cause of error cannot be determined.