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The Iceclient Web Start launcher is the recommended way to start the client, as this keeps it automatically up to date.
You will receive this error if you have your Java security settings too high for Iceclient to run. Because I have not yet purchases a code signing certificate, the client is “unsigned” code. This means it triggers additional warnings and restrictions.
To fix this, you can either lower your Java security setting to Medium, or add a site exception for armouree.vm.bytemark.co.uk. This is done in the Java Control Panel.
For All Other Problems
More to follow.