On weekends, securities companies generally have server maintenance time, so they can't surf the Internet or have password errors. Don't worry too much. You can try again the night before the trading day or before the opening. If not, contact the broker. If antivirus software and firewall are installed correctly, you won't be poisoned.

The failure of middleware connection is not the problem of computer and network, but the problem of server. Usually, don't worry. The information service company will solve it.