This error can arise after you've installed Adobe Digital Editions and when you try to "authorize" your installation of the software using a ByteBooks account.

Occasionally Adobe's activation server goes down. This is a system that belongs to Adobe and is out of our control.

Normally, if you just wait a few hours and try again, it will work. It shouldn't be having issues for more than 24 hours.

If you're on an office or organization network, check with your network administrator. Sometimes there are rules in place on a corporate network that prevent Digital Editions from communicating with the Adobe server.

If at some point you want to transfer ebooks to additional ereader devices, you'll then need to authorize each computer or device with the same ByteBooks account. And probably need to redownload the ebook after authorising as authorising ebooks happens at the point of download.

If you are still having difficulty authorising even after waiting for 24 hours, please please contact our support team.