Looking for logging into the Sagemath 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 Sagemath site. After that you can login as usual with your login credentials.
https://trac.sagemath.org/login
http://www.sagemath.org/
https://ask.sagemath.org/question/35317/how-can-i-log-in-to-my-sage-v-72-notebook/
https://sagecell.sagemath.org/
https://cocalc.com/
https://cocalc.com/app
http://sage.math.canterbury.ac.nz/
https://www.kubuntuforums.net/showthread.php/74133-SageMath-login-failure
https://wiki.archlinux.org/index.php/SageMath
https://matheplanet.com/matheplanet/nuke/html/viewtopic.php?topic=234059
https://sage.hs-mittweida.de/
https://github.com/sagemath/sagelib/blob/master/sage/server/notebook/templates/login.html
https://catalog.cnm.edu/content.php?catoid=27&navoid=3491