Interesting that you know the server name. I looked through the logs to attempt to find out the cause. I don't think that information surfaces anywhere in the UI.
I had to dig for it, prompted by seeing your post. If you click on "Show Code42 CrashPlan" to bring up the main window, then click on Destinations, Cloud, and then actually click on "CrashPlan Australia". It should show some extra info including the internet address, which I assume is my server name.