DS on HANA: Unable to create Data Source

I am using DS 1.5 SP2 on HANA cloud platform.

1. Login using XSEngine URL : Successful

2. Create new analysis application: Successful

3. Add data source: The Add Data Source wizard appears without error.

4. Click on Browse : Error

In Error Log I can see messages like:

BI exception with class "BicsHttpInaRuntimeException" and message "HTTP connection error: request returned response code 403".

I suspect some privilege is missing. But no idea which one. Any help would be appreciated.

In the admin guide I can see:

Can anyone suggest how to check if the above required privilege is already there and if not, how to grant the same ?

Thanks,

Arijit