Looking for logging into the Liferay C Portal 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 Liferay C Portal site. After that you can login as usual with your login credentials.
https://community.liferay.com/es/forums/-/message_boards/message/247380
https://stackoverflow.com/questions/16677071/lifreay-6-1-how-to-disable-c-portal-login-url-from-public-web-site
https://stackoverflow.com/questions/16677071/lifreay-6-1-how-to-disable-c-portal-login-url-from-public-web-site?rq=1
https://nisuz.wordpress.com/2011/08/30/change-the-url-when-we-hit-cportallogin-in-liferay/
https://sourceforge.net/p/lportal/news/2015/12/liferay--open-am-doesnt-redirect-to-requested-page-after-login/
https://github.com/liferay/liferay-portal/blob/master/portal-web/docroot/WEB-INF/liferay-web.xml
https://docs.oracle.com/cd/E19575-01/820-7277/giiuw/index.html
https://vulners.com/osvdb/OSVDB:38891
http://www.liferaysavvy.com/2014/03/liferay-parameter-auto-login.html
http://www.javasavvy.com/missing-login-portlet-in-liferay/
https://www.ict.inaf.it/gitlab/OACT-CTA-AAI/shibboloeth-liferay-plugin/blob/5edf988a740ea79aef63030e85ced58441e62e80/target/shibboleth-plugin-hook/WEB-INF/liferay-hook.xml
https://horrikhalid.wordpress.com/2014/01/11/custom-landing-page-in-liferay/
https://licence1.business.gov.sg/c/portal/login?p_l_id=11811