Looking for logging into the Cannot To User Manager 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 Cannot To User Manager site. After that you can login as usual with your login credentials.
https://forum.mikrotik.com/viewtopic.php?t=68243
https://wiki.mikrotik.com/wiki/User_Manager/QA/Cannot_access_User_Manager_WEB_interface
https://community.spiceworks.com/topic/1947766-cannot-load-user-manager-mikrotik-rb2011
https://stackoverflow.com/questions/18746195/tomcat-7-manager-cant-login