This situation may be due to the restriction of external websites by the school network or the setting of firewall, which leads to the inability to access Jiangsu Teacher Education Network. This restriction may be due to the consideration of school network security or other reasons. At this point, we can try to use proxy server or VPN to access, bypassing the restrictions of the school network. Of course, when using these methods, we should also pay attention to network security issues to avoid other problems caused by improper use. In addition, if you really need to visit Jiangsu Teacher Education Network, you can also apply to the school network administrator for lifting the restrictions, but you need to apply in accordance with the school's regulations and procedures.