The server is shutdown and for unknown reasons

I have been using the photon server for over a year and it has been shutdown a lot lately. After I see the log, I get the error below. Please tell me the reason:

944: 04:23:41.597 - CTCPWebSocketServer::ReadCompleted - Exception - CHandshakeParser::ParseMethod() - Unexpected method, expected: "GET" got: "

"
944: 09:37:34.687 - CTCPWebSocketServer::ReadCompleted - Exception - CRequestHeaders::ValidateBasicRequestHeaders() - Handshake headers do not include header: "upgrade" with value: "WebSocket".
"host" - "103.27.237.222:9091" - 68 6F 73 74 00 - host. -
Host: 103.27.237.222:9091

944: 09:37:35.322 - CTCPWebSocketServer::ReadCompleted - Exception - CHandshakeParser::ParseMethod() - Unexpected method, expected: "GET" got: " î ê܈÷æ©£V9ÛMõèW!èOO^ˆVÄF„±ÆÄóÙÈ"
1484: 12:30:02.503 - Service is stopped...
1484: 12:30:02.711 - Server shutting down...
1484: 12:30:02.711 - Shutdown monitoring enabled, 30000ms before process abort
1484: 12:30:02.731 - Notifying CLR applications of shutdown...
1484: 12:30:02.810 - RequestApplicationStop: 3
1208: 12:30:03.039 - CUDPSocketServer::OnError() - CUDPSocketServer::OnSendToCompletionError(): An operation was attempted on something that is not a socket.
1208: 12:30:03.391 - CUDPSocketServer::OnError() - CUDPSocketServer::OnSendToCompletionError(): An operation was attempted on something that is not a socket.
1208: 12:30:04.378 - CUDPSocketServer::OnError() - CUDPSocketServer::OnSendToCompletionError(): An operation was attempted on something that is not a socket.
1208: 12:30:05.332 - CUDPSocketServer::OnError() - CUDPSocketServer::OnSendToCompletionError(): An operation was attempted on something that is not a socket.
1484: 12:30:06.369 - RequestApplicationStop: 2
1484: 12:30:06.901 - RequestStop: defalt app domain
1208: 12:30:07.229 - CUDPSocketServer::OnError() - CUDPSocketServer::OnSendToCompletionError(): An operation was attempted on something that is not a socket.
1484: 12:30:07.498 - Shutting down WebSocket Outbound Connection Manager...
1484: 12:30:07.606 - Shutting down TCP Outbound Connection Manager...
1484: 12:30:08.192 - Shutting down ENet Outbound Connection Manager...
1484: 12:30:08.266 - Disconnecting all outbound peers...
1484: 12:30:08.346 - Shutting down ENet host...
1484: 12:30:08.346 - Disconnecting all peers...
1484: 12:30:08.346 - CUDPSocketServer::OnError() - CUDPSocketServer::OnSendToCompletionError(): An operation was attempted on something that is not a socket.
1484: 12:30:08.346 - 1 disconnected
1484: 12:30:08.346 - Shutting down socket servers...
1484: 12:30:08.347 - Shutting down ENet thread pool...
1484: 12:30:08.421 - Shutting down TCP inactivity timers...