Please open App_Code\Global.asax.vb file.
 
Add this code in function Global_BeginRequest :
 
   If (app.Request.FilePath.IndexOf("/CuteSoft_Client/CuteEditor/", StringComparison.OrdinalIgnoreCase) <> -1) Then
    Dim query As String = app.Request.Url.Query
    If query <> Nothing And query.StartsWith("?") Then
     query = query.Substring(1)
    End If
    app.Context.RewritePath(app.Request.FilePath, "/fixdnnsubportalproblem", query, False)
   End If

 

 

Keep me posted