I cannot access the Visa Application online process from Melbourne - error message 405

Good morning,
I am trying to apply for visa from Melbourne and each time I click on CVASC weblink I get a "405" error message which doesn't allow me to proceed.
I have tried several ways through different computers and my phone but same error message each time.
I tried using Auckland as my application point and that Visa application site successfully opened.
I look forward to your response.
Thank you