Looking for logging into the Sfdc Test 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 Sfdc Test site. After that you can login as usual with your login credentials.
https://login.salesforce.com/%3Flocale%3Djp
https://developer.salesforce.com/forums/%3Fid%3D906F00000008kVjIAI
https://help.salesforce.com/apex/HTViewSolution%3Fid%3D000175987%26language%3Dja
http://www.google.co.jp/url?url=http://tandc.salesforce.com/webassessor-apply
https://developer.salesforce.com/docs/atlas.ja-jp.mobile_sdk.meta/mobile_sdk/communities_tutorial_test.htm
https://developer.salesforce.com/docs/atlas.ja-jp.api.meta/api/sforce_api_calls_login.htm
https://gcsf.zendesk.com/hc/ja/articles/115007977308-Salesforce%25E3%2581%25AB%25E3%2583%25AD%25E3%2582%25B0%25E3%2582%25A4%25E3%2583%25B3%25E3%2581%25A7%25E3%2581%258D%25E3%2581%25AA%25E3%2581%2584%25E5%25A0%25B4%25E5%2590%2588%25E3%2581%25AE%25E7%25A2%25BA%25E8%25AA%258D%25E4%25BA%258B%25E9%25A0%2585
http://www.google.co.jp/url?url=http://www.jp-cloudia.co.jp/techblog/%3Fp%3D10
https://www.pasonatquila.com/blog/salesforce/tips_sandbox_basic_20170301.html
https://qiita.com/na0AaooQ/items/d3fe2d63ffcc5e268de4
https://workbench.developerforce.com/
https://csminfo.uhuru.jp/hc/ja/articles/200515004--Salesforce-%25E3%2583%25AD%25E3%2582%25B0%25E3%2582%25A4%25E3%2583%25B3%25E3%2581%25A7%25E3%2581%258D%25E3%2581%25AA%25E3%2581%2584-%25E3%2583%25AD%25E3%2582%25B0%25E3%2582%25A4%25E3%2583%25B3%25E5%25BE%258C-%25E7%2594%25BB%25E9%259D%25A2%25E3%2581%25AE%25E9%2581%25B7%25E7%25A7%25BB%25E3%2581%258C%25E9%259D%259E%25E5%25B8%25B8%25E3%2581%25AB%25E9%2581%2585%25E3%2581%2584-%25E3%2583%2591%25E3%2582%25B9%25E3%2583%25AF%25E3%2583%25BC%25E3%2583%2589%25E3%2583%25AA%25E3%2582%25BB%25E3%2583%2583%25E3%2583%2588%25E6%2596%25B9%25E6%25B3%2595%25E3%2581%25AA%25E3%2581%25A9-
https://csminfo.uhuru.jp/hc/ja/articles/115000135901--Salesforce-%25E3%2583%2587%25E3%2583%25BC%25E3%2582%25BF%25E3%2583%25AD%25E3%2583%25BC%25E3%2583%2580%25E3%2581%25AB%25E3%2583%25AD%25E3%2582%25B0%25E3%2582%25A4%25E3%2583%25B3%25E3%2581%25AE%25E9%259A%259B%25E3%2581%25AB-Failed-to-send-request-to-%25E3%2582%25A8%25E3%2583%25A9%25E3%2583%25BC%25E3%2581%258C%25E7%2599%25BA%25E7%2594%259F%25E3%2581%2599%25E3%2582%258B