Most players are now able to use the FAF service again after security was significantly strengthened. However, the DDoS attack is still ongoing, and it's possible that new attack techniques are being tested, which may occasionally affect our services.
The situation is currently under monitoring.
Edit: Players who are using a Coturn server to connect to other players are encountering some connection issues recently. A permanent solution is in the works.
As for the matchmaking penalty for unsuccessful connections, it's only temporary and you can try again later.
Edit2: The fastest way to stay up to date is by following the announcement channel on Discord