If you have written Fetch Xml code using Java script then there would be case when specific user will get the following error
“This page is accessing information that is not under its control. Thos poses a security risk. Do you want to continue?
And then if user continues it gets following error
Click on Tools in the Internet Explorer tool bar menu and
Then select Internet Options from the drop down.
Now click the Security tab and then click the “Custom Level” button.
Once this is open scroll down until you see the “Access data sources across domains” setting and set the radial button to enable.
Click the OK button followed by the Apply button to save the settings
Hope this helps