1、Jenkins There were errors checking the update sites: FileNotFoundException

2、There were errors checking the update sites: UnknownHostException: mirror.xmission.com

3、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