So, if you have upgraded to Yosemite (MacOS 10.10), you can of course expect Business Portal to stop working, as it does after every upgrade. Usually there's a Whirlpool forum on how to get it working again, but I couldn't find one.
I took me a few hours tonight to figure it out. Fortunately my GST report isn't due until next week.
Step 1. Don't go to www.java.com, because Java 7 isn't supported on Yosemite.
Step 2. Don't install Java 8 from the Oracle download site either,
The ECI client requires Java 6, for example.
Step 3. If you've done either of these, uninstall that version of Java, and remove the Java plug-in from your browser. Since Chrome doesn't do Java at all on MacOS this means Firefox and Safari.
Step 4. Download Java 6 from here: http://support.apple.com/kb/dl1572
Step 5. Follow the procedure here: http://support.apple.com/kb/ht5559 in order to activate the plug in.
Step 6. Go to http://bp.ato.gov.au/
Update: the business portal does work with Java 8, thanks to Paul Martin....
After tearing my hair out, installing, reinstalling, failing... a tech support fellow had the solution:(I'm running Firefox 33.0.1 with Java 8u25 on Yosemite 10.10)- Go to Java Control Panel- Select Advanced- Scroll down to 'Advanced Security Settings' and DESELECT 'Use TLS 1.2'- Restart browser and login to the Business Portal
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