1. Network problem: Make sure the computer is connected to the Internet, and check whether the network connection is normal. You can refresh the page or open it again later to ensure that this is not a temporary network problem.

2. Network Settings: Check the network settings of the computer to ensure that no proxy server or firewall blocks access to the website. You can change the network settings or log in using a different network environment.

3. Server problem: It is a server problem of Guangdong Education Integrated Service Platform, such as maintenance or failure. This will prevent you from logging in. You can log in again later, or check the platform's official website or social media page to get notice of any maintenance or failure.