Hi Abahrami,
You can try to reconfigure your IIS. Please recofigure it using the Syncfusion Dashboard. You can check out the online sample from the following location,
http://www2.syncfusion.com/syncfusion/infrastructure/samplebrowserasp/samples.aspx?version=2_0Then browse through the Diagram->Basic Features->ClientSide functionalities sample.
Please let me know if this helps you out.
Thanks,
Fahad