Looking for logging into the Https Salesforce Com Sandbox 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 Https Salesforce Com Sandbox site. After that you can login as usual with your login credentials.
https://login.salesforce.com/?locale=nl
https://developer.salesforce.com/forums/?id=906F00000008kVjIAI
https://mobile1.t.salesforce.com/
https://success.salesforce.com/answers?id=9063A000000kpuqQAA
https://help.salesforce.com/htviewsolution?id=000175987
https://help.salesforce.com/apex/HTViewHelpDoc?id=data_sandbox_create.htm&language=en
https://help.salesforce.com/apex/HTViewSolution?urlname=Configuring-Data-Loader-38-for-OAuth-login&language=en_US
https://developer.salesforce.com/docs/atlas.en-us.api.meta/api/implementation_considerations.htm
https://success.salesforce.com/issues_view?id=a1p3A000000EAHzQAO&title=summer-17-unable-to-log-in-to-sandbox-with-my-domain-prevent-login-from-https-test-salesforce-com-post-enabled-post-upgrade
https://help.salesforce.com/apex/HTViewHelpDoc?id=domain_name_login_branding.htm
https://help.salesforce.com/HTViewHelpDoc?id=users_login_history.htm
https://salesforce.stackexchange.com/questions/63668/cannot-login-through-https-test-salesforce-to-the-recently-refreshed-sandbox
https://salesforce.stackexchange.com/questions/31543/how-to-login-into-a-sandbox-from-sandboxes-page-in-production-org