The possible causes of this problem are as follows: 1. The interface is a local interface, for example, XXXX :8080, but the local computer and the server computer are not on the same LAN (that is, the wifi is not the same) 2. The time data submitted to the background is too large or in an incorrect format. Procedure
Solution: 1. Ping to check whether the ping succeeds. Open CMD, run ping 177.177.3.111, and press Enter