Looking for logging into the Joomla Remote_user 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 Joomla Remote_user site. After that you can login as usual with your login credentials.
https://forum.joomla.de/thread/5353-joomla-automaitische-anmeldung-mit-ad/
https://forum.joomla.org/viewtopic.php?t=317381
http://www.joomlaportal.de/joomla-erweiterungen-plugins/183800-single-sign-remote_user.html
https://danieljamesscott.org/all-articles/10-articles/configuration-guides/10-joomla-kerberos-and-ldap-integration.html
https://www.mediawiki.org/wiki/Extension:Auth_remoteuser
https://stackoverflow.com/questions/25333801/how-to-populate-the-remote-user-in-apache-server-from-active-directory-sso-rela
https://www.planet4.se/ssoldap-on-joomla-running-on-ubuntu-linux/
https://joomisp.de/de/support/forum/server-control-panel-plugins-de/15-ispconfig-remote-user-rights
https://joomisp.de/en/support/forum/server-control-panel-plugins-de/15-ispconfig-remote-user-rights
https://blackbricksoftware.com/bit-on-bytes/173-authenticating-redash-with-joomla-using-mod-authnz-external
http://steve.heyvan.com/2014/07/27/building-sso-on-joomla-2-5-with-active-directory/
https://serverfault.com/questions/551589/remote-user-not-getting-set
https://pydio.com/en/docs/v7-enterprise/enabling-sso-php-based-cms-dupral-joomla-wordpress-your-own