Hello, reason: the password of the tax control panel was entered incorrectly, exceeding a certain number of times, which led to the lock of the tax return panel. Solution: Take the tax control panel to the lobby of the tax bureau and unlock the password in the freight backstage. The tax control panel (also called "tax control server") is a special tax control device, which was developed according to State Taxation Administration of The People's Republic of China's "Technical Specification for Tax Control Panel". The tax control panel is divided into single tax number tax control server and multi-tax number tax control server.