For some reason, my app can crash a remote server.

I need to detect when the connection is lost, in my app. I tried to
use TIB_Connection.Connected propery, but it is always true.

To simulate it, I start my program, then from Firebird Server
Control, I stop the service, then I execute some SQL sentence in my
program.
The "connection lost" exception appears, but the
TIB_Connection.Connected property is true.

I suppose that this property indicates another thing, but I would
like to known how I can detect is the current connection is valid.

Thanks in advance