找不到证书。使用在 IPSec 上的 L2TP 协议的连接要求安装机器证书，这也叫做计算机证书。将不会接受 L2TP 呼叫。

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A certificate could not be found. Connections that use the L2TP protocol over IPsec require the installation of a machine certificate, also known as a computer certificate. No L2TP calls will be accepted.

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