I have the same issues, have spent a lot of time on the phone to quickbooks help. They have never heard of the issue and not sure why its there. Basically they do not have any answers.
It seems both you and cowanunder are experiencing the same outage.
This happened due to a recent change on the ANZ website which interrupted the QuickBooks bank connection.
As a result of this change, if customers are signed into ANZ internet banking website and simultaneously attempting to connect with ANZ account in QuickBooks, customers will be prompted in-product to sign out of other device e.g. ANZ internet banking website (error 179).
This is a result of a ANZ security setting limiting the access to ANZ on multiple devices/browsers. Please sign out of any other instances before attempting to update your bank feeds.
If this persists then please get in touch with our support team who will help you troubleshoot or escalate this further if needed. Check this article to learn how and also check our support hours: Get help with QuickBooks products and services.
Allow me to share some information about the issue you’re experiencing in your bank feeds.
We receive reports that some customers are getting error 179 when connecting to ANZ bank. Our engineers are working to get this issue resolve as soon as possible.
We encourage all affected users to contact our QBO Care Team and provide this number: INV-59238. This way, you can sign up for the list of affected users. You’ll receive an email once there’s an update about the investigation.