Can not link data to SharePoint list from Access

I'm working with Sharepoint 2013 & MS Access 2013, till yesterday, everything still good, I click on the button Open with Access, input data, share to site...

BUT TODAY, the button Open with Access has been disabled (i dont know why) so I must create a DB and connect to Sharepoint site through External Data/More/Sharepoint list. But when I input the link http://10.x.x.x/MySite/ to Specifyy a Sharepoint site: text box, i get the error message "Microsoft Access could not connect to the site you specified. Verify the address of the site or contact your site administrator". What can I do to connect to the site with MS Access again?