Open CRM Web site from IIS Server.
Right-click the Web.config
file, click Open With, and then click Notepad.
Go to the below line
Change it to maxRequestLength=”20000”
Change executionTimeout="3600"
This is has worked for me.
Important: After completing the action that requires the above changes to the web.config file, these parameters should be reset to their default values.
Important: After completing the action that requires the above changes to the web.config file, these parameters should be reset to their default values.