证书是刚下载的，没过期；另外证书路径是绝对路径，已经检测到证书了，但是在发起退款时就出现上述错误，链接超时: Caused by: java.net.ConnectException: Failed to connect to api.mch.weixin.qq.com/240e:e1:a900:50:0:0:0:4a:443         at okhttp3.internal.connection.RealConnection.connectSocket(RealConnection.kt:268)         at okhttp3.internal.connection.RealConnection.connect(RealConnection.kt:180)         at okhttp3.internal.connection.ExchangeFinder.findConnection(ExchangeFinder.kt:238)         at okhttp3.internal.connection.ExchangeFinder.findHealthyConnection(ExchangeFinder.kt:111)         at okhttp3.internal.connection.ExchangeFinder.find(ExchangeFinder.kt:79)         at okhttp3.internal.connection.Transmitter.newExchange$okhttp(Transmitter.kt:163)         at okhttp3.internal.connection.ConnectInterceptor.intercept(ConnectInterceptor.kt:35)         at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.kt:112)         at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.kt:87)         at okhttp3.internal.cache.CacheInterceptor.intercept(CacheInterceptor.kt:82)         at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.kt:112)         at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.kt:87)         at okhttp3.internal.http.BridgeInterceptor.intercept(BridgeInterceptor.kt:84)         at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.kt:112)         at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(RetryAndFollowUpInterceptor.kt:71)         at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.kt:112)         at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.kt:87)         at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.kt:194)         at okhttp3.RealCall.execute(RealCall.kt:67)         at com.jfinal.weixin.sdk.utils.HttpUtils$OkHttp3Delegate.postSSL(HttpUtils.java:366)         ... 100 more Caused by: java.net.ConnectException: Network is unreachable (connect failed)         at java.net.PlainSocketImpl.socketConnect(Native Method)         at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:476)         at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:218)         at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:200)         at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:394)         at java.net.Socket.connect(Socket.java:606)         at okhttp3.internal.platform.Platform.connectSocket(Platform.kt:117)         at okhttp3.internal.connection.RealConnection.connectSocket(RealConnection.kt:266)