To be able to use CRM.pad, you need:
When an Aurea CRM web version is installed, Mobile Services is automatically installed as well, if it is included in your license. The update.Mobile.Services.dll is installed in the \bin directory and the settings.xml and web.config files are changed accordingly >> Mobile Services and IIS 7.0.
You need to enable the CGI restrictions for .net Framework (.net Framework is included in your Aurea CRM web installation). Start Aurea CRM web with .net Framework 4.0 and enable the CGI restrictions.