[808]There were errors checking the update sites: SSLHandshakeException: sun.secu解决方案

（1）插件管理页面提示：There were errors checking the update sites:IOException:Unable to tunnel through proxy.Proxy returins “HTTP/1.1 400”

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（2）插件管理页面提示：There were errors checking the update sites: SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

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查到的解决方法是同一个：

解决方案：
进入插件管理->Advanced,修改Update Site的URL，
默认是通过https://updates.jenkins.io/update-center.json进行更新的。此处，将https改为http，修改完成，submit，然后重启Jenkins，问题解决。