Log in as an administrator to edit the hosts file in Mac OS.
In a Finder window, choose Go > Go To Folder.
Select the hosts file and open it using Text Editor.
Back up the hosts file: Choose File > Save As, save the file as hosts.backup, and then click OK.
Search the original hosts file for entries that reference activate.adobe.com (for example, 127.0.0.1 activate.adobe.com) and delete these entries.
Save and close to overwrite the file.