unable to verify the first certificate

Error: unable to verify the first certificate

    at TLSSocket.onConnectSecure (_tls_wrap.js:1317:34)

    at TLSSocket.emit (events.js:203:13)

    at TLSSocket._finishInit (_tls_wrap.js:792:8)

    at TLSWrap.ssl.onhandshakedone (_tls_wrap.js:606:12)

请问这个要怎么弄，我之前不知道怎样弄好了，我在internet里面重置了下网络，就又不好使了求解。