错误代码：500
错误信息：Connection Timeout Expired. The timeout period elapsed while attempting to consume the pre-login handshake acknowledgement. This could be because the pre-login handshake failed or the server was unable to respond back in time. The duration spent while attempting to connect to this server was - [Pre-Login] initialization=28; handshake=14992; Exception of type 'System.Web.HttpUnhandledException' was thrown.
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