Access problems with oauth2-salesforce-example.app could result from improper redirect configurations between different versions. If this is the case, please see the links below:

http://oauth2-salesforce-example.app http://www.oauth2-salesforce-example.app https://oauth2-salesforce-example.app https://www.oauth2-salesforce-example.app

Or return to the current status page of oauth2-salesforce-example.app.