Looking for logging into the Na4 Salesforce 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 Na4 Salesforce site. After that you can login as usual with your login credentials.
https://login.salesforce.com/
https://developer.salesforce.com/forums/?id=906F00000008kVjIAI
https://success.salesforce.com/answers?id=90630000000ghLuAAI
https://help.salesforce.com/apex/HTViewSolution?urlname=Updating-Hard-Coded-References-FAQ&language=en_US
https://workbench.developerforce.com/
https://itunes.apple.com/us/app/salesforce/id404249815?mt=8
https://stackoverflow.com/questions/7504057/python-salesforce-library-to-get-salesforce-data
https://www.matchmyemail.com/wiki/frequently-asked-questions/enable-api-access-salesforce/
https://www.youtube.com/watch?v=56GPa6XBiMw
http://websites.milonic.com/na4.salesforce.com
http://weblisting.freetemplatespot.com/na4.salesforce.com
https://twitter.com/salesforce/status/255363573889515520
https://books.google.de/books?id=uqRJAgAAQBAJ&pg=PA28&lpg=PA28&dq=na4+salesforce+login