There are a number of reasons why you may not be able to access the site. Firstly, check that you are typing your username and password correctly - remember they are case sensitive and should not include any spaces. You may want to try clearing your cache before attempting to login.
Your access could have also ceased due to end of your access period being reached, the concurrent user limit being exceeded or abuse being detected on your account.
It's also worth remembering that you can only have one live log on at a time, so, for example, you cannot log on to your subscription on both a PC and a tablet. If you attempt to do this you'll see an error message. If you forget to log out from a previous device, wait half an hour for the system to reset itself before you try again.
If you are unable to ascertain why you are unable to access please contact our customer support team at trovehelp@oup.com, providing details of any error message you receive.