 failed to download data from ib 

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