failed to download data from ib

[Julinzhou]

it just shows that i have connected to the client, but just timeout when i downloaded
the data from ib it just warned me that it times out , then the graphical interfaces of my client shows
the status of history_data_center is inactive, i just want to use ib-api, but it never works, so
i really need your help to download the data from ib-api, Looking forward to hearing from you

[Julinzhou]

when i use quandl to download data, it warns me that" (Status 400) (Quandl Error QEAx01) We could not recognize your API key. Please check your API key and try again", i just don't know how to deal with it ,