When installing Enterprise Portal for Dynamics AX 2009 one of the most often reported reasons for a failing installation is the uncompiled SysDevelopmentProxy class.
In the DynamicsSetup.txt log file this manifests in the following error message:
The reason for this issue is that .NET Business Connector is (or was) not installed on the Microsoft Dynamics AX Client where the initialization checklist was run. Therefore the SysDevelopmentProxy class was (and still is) not compiled. Since a method of this class is going to be called during the Setup of Enterprise Portal the installation will fail.
To compile the SysDevelopmentProxy class manually:
If you receive a compile error the .NET Business Connector is most likely not installed.