Access the ATO Business Portal using AusKey Mac OS X Mountain Lion

Install the latest JRE from Oracle
In the Java Control Panel, go to the Security tab and make sure 'Enable Java Content' is checked
Open Safari
Go to the ATO Business portal site https://bp.ato.gov.au/BpStatics/homepage.htm
Click Login
A dialog will apear asking you 'Do you want to trust the website “authentication.business.gov.au” to use the “Java” plug-in?'
Click 'Trust'
Now you will be asked 'Do you want to run this application?'
Click 'Run'
Another dialog will appear asking you to 'Allow access to the following application from this website?'
Click 'Allow'
You will now get the following error message:

An error has occurred with a result code of 4402.
[message=Read-only files cannot be used as keystores: /Users/warner/Library/Application Support/AUSkey/keystore.xml, errorCode=4402]

NOTE: Changing the file permissions on the keystore will not help, the ATO requires access to the file system!
To allow file system access, select Safari -> Prefereces... from the menu
Go to the Security tab and click 'Manage Website Settings...'
On the left-hand menu select Java
In the right-hand pane you will see authentication.business.gov.au, in the drop-down menu select 'Run in Unsafe Mode'
A dialog will appear asking 'Are you sure you want to trust the website “authentication.business.gov.au” to run “Java” in unsafe mode
Click 'Trust'
Click 'Done' and exit Preferences
Open the ATO Business portal site again https://bp.ato.gov.au/BpStatics/homepage.htm
Now you will be asked 'Do you want to run this application?'
Click 'Run'
Another dialog will appear asking you to 'Allow access to the following application from this website?'
Click 'Allow'
You should now be able to select your AusKey and login to the Business Portal

warnergodfrey/gist:7512051

Wincott commented Sep 21, 2018