Looking for logging into the Shibboleth Handler 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 Shibboleth Handler site. After that you can login as usual with your login credentials.
https://wiki.shibboleth.net/confluence/display/SHIB2/X.509+Login+Handler
https://wiki.shibboleth.net/confluence/display/SHIB2/SSO-CAS+Login+Handler
https://wiki.shibboleth.net/confluence/display/SHIB2/Multi+Factor+Login+Handler
https://wiki.shibboleth.net/confluence/display/IDP30/AuthenticationConfiguration
https://www.dfn.de/fileadmin/3Beratung/Betriebstagungen/bt56/forum-aai-gietz.pdf
http://shibboleth.1660669.n2.nabble.com/Custom-Login-handler-td6745312.html
https://www.drupal.org/project/shibboleth_drupalauth
https://github.com/Yubico/yubico-shibboleth-idp-multifactor-login-handler/blob/master/examples/login.jsp
https://books.google.de/books?id=1A-NDrcXuigC&pg=PA359&lpg=PA359&dq=shibboleth+login+handler
https://stackoverflow.com/q/27514328
https://www.yubico.com/works-with-yubikey/catalog/shibboleth/
https://books.google.de/books?id=zL46AwAAQBAJ&pg=PA50&lpg=PA50&dq=shibboleth+login+handler
https://www.switch.ch/aai/guides/discovery/login-link-composer/