There are currently problems with logging into ebooks and some databases. ICT have been informed of the problem and are currently working on a solution however it may take until the end of the week for services to be back to normal.
In the meantime if you are unable to log in to a resource (i.e. you get an authentication error message) close the error page and reclick on the ebook / resource and it may well let you in. You may need to do this several times before it works.