1, network problem, check whether your network connection is normal, you can try to reconnect the network or change the network.

2. Website maintenance. It may be that Jilin Continuing Education Network is undergoing system maintenance, which makes it temporarily inaccessible.

3, browser cache problem, the browser cache expired or the cache was emptied, you can try to clear the browser cache and visit the website again.

4, DNS server problems, DNS server analysis is abnormal, you can try to replace the DNS server or wait for the DNS server to repair itself.