CR for vs2008 not connecting on Windows Server 2012R2

I have an application running on Windows Server 2008R2 which I urgently need to mirror on Windows Server 2012R2.

However, my crystal reports basic runtime for vs2008  version 10.5.1.0

and crystal reports basic runtime for vs2008(64) version 10.5.0.0  brings up the report but doesn't seem to connect to the

database  (it seems to be pulling in a null dataset)

What am I doing wrong?  [I tried opening all incoming ports, etc, etc]

This is the web.config line: 

<add assembly="CrystalDecisions.ReportAppServer.ClientDoc, Version=10.5.3700.0, Culture=neutral, PublicKeyToken=692fbea5521e1304"/>

[changing this crashes the application]