According to the guide of finance and taxation service network: 1. Verify whether the server address is correct: click System Settings-System Parameter Settings-Parameter Settings-Network Configuration to verify the server address, port configuration and copy address. If there are no errors, the test connection will succeed. 2. Click System Settings-Tax UKey Settings-Tax UKey Clock Calibration to view the current clock. If the current clock is not displayed correctly, click Update tax UKey Clock to adjust the Tax UKey clock to the correct time. 1. Solution: 1. Please first confirm whether the server address of the network configuration is accurate; 2. It may also be the peak period of online newspaper copying, the server is busy, or the server network of the tax bureau is faulty; 3. It is also possible that the digital certificate is invalid. In this regard, it is recommended to contact the staff of Baiwang. 2. Other methods: 1. Close the billing software, reinstall this file, and then log in to try to invoice; 2. Call customer service: 4006 1 12366. Important reminder: In order not to affect the overdue period, you can bring the tax control panel to the tax office to copy the report. Third, check the server address. Fourth, note that each province is different. Click "Open" to query the server address of all provinces in China: Baiwang Jin Fu Invoicing Software Service.