Recently, I was working on Geocoding with the Bing Maps Silverlight Control for a SharePoint 2010 Sandbox application. Everything was going awesome on my on-premise SharePoint 2010 environment but when I uploaded the application in Office 365, every time the application would load I would get a pop-up in IE asking whether to "Display Mixed Content?"
I googled for a solution and manged to learn that since the Office 365 environment was HTTPS and the Bing Maps GeoCoding web service was HTTP, I was being presented with this dialog box asking permission to display both HTTP and HTTPS content. This was also the reason why I was not getting the same pop-up on my on-premise SharePoint 2010 environment as it was also HTTP.
So the solution to this problem I thought was to find an HTTPS version of the Bing Maps GeoCoding web service so I made the following changes in my ServiceReferences.ClientConfig file:
1)Changed the URL of the web service to HTTPS
2)Changed the security mode of the basicHttpBinding from 'none' to 'Transport'
And voila! The annoying pop-up disappeared!
My final Service ServiceReferences.ClientConfig file looked like this:
<binding name="BasicHttpBinding_IGeocodeService" maxBufferSize="2147483647"
<security mode="Transport" />
<httpTransport maxReceivedMessageSize="2147483647" maxBufferSize="2147483647" />
contract="GeocodeService.IGeocodeService" name="BasicHttpBinding_IGeocodeService" />
contract="GeocodeService.IGeocodeService" name="CustomBinding_IGeocodeService" />