This method is Discontinued. Please refer new product QODBC for QuickBooks Online:

How to use QODBC Online with QuickBooks Online Edition (Apps.com)

How to Reconnect QODBC Online with QuickBooks Online Edition (Apps.com)

Problem

QODBC Shows a login page & login window when connecting with QuickBooks Online Edition.

Solution

This could be an issue with your login key or the account associated with your connection/login key.

I kindly suggest you verify your login/connection key,

Also, please do refer:
http://support.flexquarters.com/esupport/index.php?/Default/Knowledgebase/Article/View/2380/0/how-to-use-qodbc-with-quickbooks-online-edition
And
http://support.flexquarters.com/esupport/index.php?/Default/Knowledgebase/Article/View/2487/0/troubleshooting--losing-connection-to-quickbooks-online-when-qodbc-is-idle-for-sometime

Please create a support ticket and share it if you still face the issue.
Log Files from

1) QODBC Setup Screen -- > Messages -- > Review QODBC Messages.
2) QODBC Setup Screen -- > Messages -- > Review SDK Messages.
3) Screenshot of QODBC Setup Screen -- > About.
4) Screenshot of the issue you are facing.

Keywords: setup for on-line

Tags: QuickBooks Online, QBO, Issue in connecting with QuickBooks Online company file, the connection key