I cannot connect to the server I cannot connect to the server

[xipu]

I cannot connect to any server, including the LAN server.I turned on the LAN server and found that it was connected, but it was automatically disconnected after a few minutes. I need help

[N] Incoming connection from 127.0.0.1
[N] 127.0.0.1:57420 has been disconnected.

The client also changed from showing the connection server to Connection lost. Reconnecting

When I click on the linked server again, Establishing Connection is displayed

The server also shows

[N] Incoming connection from 127.0.0.1

But after a few minutes it shows

[N] 127.0.0.1:57420 has been disconnected.