When Pulse is configured with a Location Awareness rule that automatically establishes a connection and Lock Down mode is enabled on the connection if the user enters the wrong credentials and clicks "Cancel" during the authentication phase, the connection gets disabled with the status of "Disconnected - manual override" displayed in the Pulse client.
The "Connect" button is greyed out and the connection cannot be launched manually similar to the screenshot below:
This issue affects the following Pulse client versions:
5.3R4 and below