Error 521: Web server is down.Please help me!

Three days ago, the site could still be used.
Previously, it worked smoothly.
Firewall is not running.
The website is used for agent.

v2rayN:[Warning] failed to handler mux client connection > Proxy|VMess|Outbound: failed to find an available destination > Retry: [Transport|Internet|WebSocket: failed to dial WebSocket > Transport|Internet|WebSocket: failed to dial to (wss:// 521 Origin Down > websocket: bad handshake] > Retry: all retry attempts failed

#CommunityTip 521

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