Re-enable the certificate. Maybe you just downloaded the certificate and didn't enable it. After you insert the shield, there is a sign of rural credit cooperatives in the lower right corner. Double-click to open an interface, click the digital certificate, and then click the+sign of the folder money in the box below. You can see the signed certificate when you leave. Click View Certificate, click Install Certificate, and then restart the computer. I think so. If it still doesn't work, you can ask me on QQ, 2 156579 17.