Looking for logging into the Ctf 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 Ctf site. After that you can login as usual with your login credentials.
https://www.ctf.com.br/login/
https://medium.com/bugbountywriteup/angstrom-ctf-2018-web-challenges-writeup-8a69998b0123
https://medium.com/secjuice/hack-the-superadmin-uncle-organisations-ctf-solution-dd8bbe042945
https://s0cket7.com/picoctf-web/
http://servicos.ibama.gov.br/
https://ctftime.org/team/7012
https://ctftime.org/writeup/12065
https://ctf.hacker101.com/auth
https://securitybytes.io/vulnhub-com-mr-robot-1-ctf-walkthrough-7d4800fc605a
http://www.ctfillinois.org/portal/login.html
https://metactf.com/club/login
https://www.youtube.com/watch?v=tjLY1yN_WXE
https://github.com/orf/CTF/blob/master/src/flag/templates/login.html