Two possible websites are under maintenance, so they can't be accessed due to instability. This possibility is very great.
There is something wrong with your computer system, too. Your browser was hijacked and poisoned. You can clean up plug-ins, repair the system and fix ie lsp, or upgrade your browser to the latest version, or use third-party traffic Firefox chrome.
Check whether the status information of broadband connection obtains the public network ip address, DNS address, etc. , you can reconnect.
Turn off the broadband cat for 3 minutes and then restart the connection to see if it is a device problem or a line problem.
Not yet. Call the customer service phone of isp service operator directly for maintenance.