Google Analytics utm_source

I have an issue where Google Analytics referral URL strings are being blocked ?utm_source=blah…. these give the:
403 Forbidden Error Page
If you arrived here due to a search or clicking on a link click your Browser’s back button to return to the previous page. Thank you.
How do I fix/allow these stings?

• This topic was modified 5 hours, 34 minutes ago by  AITpro Admin.