When the Pulse Desktop Client for Windows is configured for a wireless 802.1X connection and the wireless network is out of range the client will report a 'failed' message. There are two messages one for broadcast SSIDs and one for non-broadcast SSIDs. In both cases the "no" symbol or circle with a slash is visible in the system tray.
With more end users working from home these days as in the office it is now common to be "out of range".
Broadcast SSID Non-broadcast SSID