Realise it has been some time since updating this thread.
We did resolve our issue of piggybacking by setting the Bluecoat Proxy Authentication Mode from 'ProxyIP' to 'Proxy' but have found some other issues in the process.
Users with passwords that exceed 14 characters are unable to authenticate through the BlackBerry Browser and any users with a colon (
in their password are also unable to authenticate.
In addition to this, we find that any user who enters their password incorrectly on the first credentials request but then enters their password correctly on the second request, is once again prompted for their credentials a third time, even though on the second request they entered the correct password.
Has anyone else had any issues with passwords and authentication through the BlackBerry Browser?