This often happens when you use ssr or other ladders and don't close the software correctly (for example, close the software directly without quitting). Solution: Set-& gt；; Network-> Manually set the proxy-> Use proxy server-> Off 1) If it is a broadband problem, first connect the broadband network cable directly for testing. If it is a broadband problem, contact broadband customer service to solve it. 2) If it's a router problem, if it worked before, it won't work for the time being. My own way is to disconnect the power of the router and plug it in. See you later. If it can be restored to the factory settings, it can be used in strict accordance with the instructions. You don't understand, so it is not recommended to set it at will (this is sometimes caused by the slow or failed IP address search of the router under the premise of correct physical connection, not the router is broken). If I can't solve it all the time, I suggest calling the customer service of the router. They have telephone online guidance. If I encounter problems that I can't solve, it is very useful to ask their advice. They will provide correct advice for your setup or operation.