I am connecting from home to work using Cisco AnyConnect Secure Mobility Client, in a browser window. Everything works, but the key press events for [ and \ are not recognized. My keyboard works fine in every other application. It's a standard Querty desktop keyboard. All other key press events are relayed to the remote machine, but [ and \ do not produce any output.
Other symbols located on the same physical keys: { = shift+[ and |=shift+\ work fine.
My office PC seems to be running the "Citrix HDX Realtime Connector". I am using Firefox.
How can I troubleshoot this? Which layer is capturing the [ and \ key press events? Where is this configurable?