Down for technical repairs / updates would be the possibility if unconnectable on a Sunday.
Oh dear, the forex market will be operating 24 hours on weekdays and closes at weekends. Depending upon the time zones, the weekend time slot may vary. But for understanding, the forex market will be open on weekdays and closed at weekends.
New traders can profit from demo accounts since they allow them to familiarise themselves with trading software and acquire a sense of how the market works. Traders should be aware, however, that simulated results rarely match actual trading results.
In the right lower corner there should be connection indicator if it shows its connected then quotes should change. Try to open demo trades to see if it executes if not then there is definitely an error.