MS Dynamics and Power Platform Blog

This blog will explain why Microsoft Dynamics CRM prompts for Windows Credentials when you log on to your development environment (configured for IFD ) using the server's IP address or the Host file configured URL (such as http://contoso.crm.grapecity.org). This is basically determined by MS CRM by reading the registry value of the key [HKEY_LOCAL_MACHINESOFTWAREMicrosoftMSCRM]- IfdInternalNetworkAddress. In reality, Microsoft Dynamics CRM will look at the IP address of the incoming request and match it against the internal range of the registry key specified. If the request is in the internal range of the registry key, it will give you a "Windows experience." If the IP address is external, it gives an "IFD experience." This registry can be modified to switch between the windows and the IFD experiences (and this is supported :)). You will need to set the value for the "IfdInternalNetworkAddress" registry key in order to change the internal subnet of th...

When deploying my custom web pages for an IFD deployment, I got a FileLoadException (Exception from HRESULT: 0x80131401) on accessing the page in the browser. Basically, this issue arose since anonymous access was somehow disabled for the “ISV/CustomPages” application in IIS while by default it is enabled for the Microsoft Dynamics CRM website. This implied that my custom web site was using Windows NT Authentication, while the Microsoft Dynamics CRM Website was enabled for anonymous access. Hence, I got “Loading this assembly would produce a different grant set from other instances” on accessing any of my web pages from within MS CRM. Simply turning on anonymous access for my custom website did the trick and rendered all my custom web pages correctly :)