The computer can't connect to the public network of the hotel.

You mean why the computer can't connect to the hotel's public network?

1.WiFi itself has a problem. It may be that WiFi is not connected properly, which makes it impossible to access the internet.

2. There is something wrong with the router, which may be overheated or damaged.

3. Broadband may be in arrears, so it is impossible to access the Internet.

4. The 4.WiFi name contains Chinese, which makes some mobile phones unable to access the Internet.

5. There is a problem with the mobile phone system. It may be that there is a problem with the system, which leads to the connection to WiFi but the inability to access the Internet.