Looking for logging into the Authentication Using Qnap site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Authentication Using Qnap site. After that you can login as usual with your login credentials.
https://www.qnap.com/tr-tr/how-to/tutorial/article/how-to-enhance-account-security-using-2-step-verification
http://docs.qnap.com/nas/QTS4.3.4/en/GUID-F0404575-14C0-4F5E-B075-A60B26F0C7E1.html
https://www.qnap.com/en/how-to/tutorial/article/how-to-use-qnap-nas-as-a-radius-server/
https://forum.qnap.com/viewtopic.php?t=114741
https://www.qnap.com/en/how-to/faq/authentication//
https://www.qnap.com/en/how-to/tutorial/article/connect-the-qnap-nas-to-an-ldap-directory/
https://www.qnap.com/en/how-to/faq/article/i-created-a-nas-user-account-with-a-username-that-is-also-an-email-address-e-g-nasuser1qnap-com-why-is-this-user-unable-to-access-the-nas-from-a-mac-computer/
https://www.qnap.com/en/how-to/tutorial/article/how-to-use-the-built-in-ldap-server-of-qnap-nas-for-user-management//
https://download.qnap.com/dev/API_QNAP_QTS_Authentication.pdf
https://www.qnap.com/en/how-to/faq/article/why-are-long-domain-usernames-not-completely-displayed-on-the-nas-user-management-ui-when-using-active-directory-authentication/
https://www.qnap.com/en/how-to/tutorial/article/how-to-sync-ldap-data-on-qnap-qts-nas-to-google-apps-directory-sync//
https://www.qnap.com/en/how-to/tutorial/article/how-to-join-qnap-nas-to-microsoft-active-directory-ad//
http://docs.qnap.com/esnas/2.0.0/en/GUID-793BF1F7-D3C5-45C8-A074-555651E07C6D.html