I am having trouble accessing the authorisation server. I get this message even though I am on line 'Connection Error. Digital Editions could not connect to the activation server. Please check you are connected to the internet

I have recently been having all kinds of problems with ADE.  I have had ADE 3.0 installed for quite some time with no problems until very recently.  Long story short I ended up deauthorizing ADE, and then couldn't authorize my computer again.  I tried everything, uninstalling, reinstalling, rebooting, nothing worked.  Finallly went into my administration account and ADE showed as authorized, but when I tried to add a library book it told me it wasn't authorized, so I deauthorized in my admin account, and reauthorized and it worked.  Tried to add the book, and it transferred, then plugged in my Kobo Glo & was able to add the book to it as well.  When I change from my admin account to the one I normally use, the book I just added doesn't show, & ADE doesn't show as authorized.  None of it makes sense, but try running from your admin account and it may work for you as well.

You should check if Firewall Adobe Digital Edition blockt.