Unable to Download Error getting License, License Server Communication Problem: E_IO_CANNOT_OPEN

Already found out it is not the source where I get my ebooks. Already found out it is not my AdobeID. It is the connection between downloaded books and opening them in Digital Editions. Already made sure it is authorized correctly. What license is it talking about

Error Message is as follows:

Unable to Download

Error getting License, License Server Communication Problem: E_IO_CANNOT_OPEN