I can't access Plesk control panel. What should I do?

There may be several reasons for this:

1. If you see "Account is blocked" message and cannot access the control panel when addressing your website, the most likely cause is that the prepaid operation period has expired. You can find out the date which your Hosting service has been paid for in R01 account manager. Besides, your hosting service can be renewed there, if necessary. The account can be blocked also because of violation on your part of the hosting agreement provisions (e.g., sending spam e-mails or exceeding the permissible server load). In this case you shall contact the technical support department (by phone or e-mail) and ask them to explain the reason for the block.
2. Probably, you have incorrectly indicated the link for the control panel access. Please note that the control panel is accessed via HTTPS on port 8443, i.e. the link to the control panel looks as follows: https://webX.r01.ru:8443, where Х is your server number. There are several ways to find out your server address: look at the e-mail with confirmation that the hosting has been successfully setup, in R01 account manager → Hosting section → Server column, contact R01 technical support department (by e-mail or phone).
3. The entered login and/or password is incorrect. There are several ways to check your login: look at the e-mail with confirmation that the hosting has been successfully setup, in R01 account manager → Hosting section  → Plesk login, or contact R01 technical support department (by e-mail or phone).
   You cannot view the password for Plesk authorization; you can only change it.
4. Probably, your provider closed port 8443. Plesk control panel operates on port 8443, however, there is a possibility to connect the panel on port 443. For this, you need to contact the technical support department by e-mail.
5. If no authorization error occurs, but you cannot enter Plesk control panel make sure that your browser has cookies enabled. Then, clear the cookies and restart the browser having preliminary closed all tabs. If it doesn't help, try to install another browser, e.g. free Firefox browser.