Why can't I log into Salesforce sandbox?
If your web browser has saved your login information from before the last sandbox refresh, your login attempts will likely fail. Clear your browser's cache, cookies, and saved passwords, then restart your browser to make sure that all old login information is deleted.
How do I access my Salesforce sandbox API?
You can access documentation for the Sandbox API and issue API calls from the Sandbox API user interface. Click Authorize to log in with the API Client ID you configured using Account Manager. For details about the API call, expand the API method and click the Model for each call.
How do I log into Salesforce?
To log in to your Salesforce account, simply go to https://login.salesforce.com/. If your company has a custom domain and you need to log in that way, head to login.salesforce.com and click on the “Use custom domain” button in the bottom right corner of the box.