InfoPath Dev

Given the following:

• 2 sharepoint installations (Dev & Production)
• Production is SharePoint 2010
• Deve is SharePoint 2013
  
• Common user accounts between the 2 installations (aka Active Directory) 
• Common network between the 2 installations
• Using browser based form designed in InfoPath 2010
  

When I publish a form on Dev that is configured to read data from Production's lists & libraries to populate controls like drop down lists but it does work in InfoPath 2010 preview

How do I configure the dev site and/or the InfoPath form to work correctly so it can read & write from & to the lists & libraries on the Production SharePoint?

 I get the following error when I open a browser based form

System.Net.WebException: The operation has timed out
at System.Net.HttpWebRequest.GetResponse()
at Microsoft.Office.InfoPath.Server.SolutionLifetime.DataAdapterSharepointListQuery.SendSoapRequestAndReturnResultSync(DataAdapter adapter, WebRequest request)

I've

• extended the InfoPath Services timeout settings on Dev's central admin
• added a trust relationship from dev to sharepoint in central admin using productions ssl cert
  

but that didn't seem to help