事情的经过： 支付查询接口都ok， 退款接口一直报443错误， 重新更新了一下证书，还是不行。

1  没有异常，证书也没有过期。

2  mac环境， 用的绝对路径

3  给自己的系统使用的， 也无所谓服务商模式

哪位大神已经踩过该坑， 给指导一下

java代码：

    /**
     * 设置ssl
     */
    SSLConnectionSocketFactory sslsf = null;
    try{
        //注意PKCS12证书 是从微信商户平台-》账户设置-》 API安全 中下载的
        KeyStore keyStore = KeyStore.getInstance("PKCS12");
        //指向你的证书的绝对路径，带着证书去访问
        FileInputStream instream = new FileInputStream(new File(SSL_CERT_PATH));//P12文件目录
        try {
            //下载证书时的密码、默认密码是你的MCHID mch_id
            keyStore.load(instream, CxpConstants.MCHID.toCharArray());//这里写密码
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            instream.close();
        }
        //下载证书时的密码、默认密码是你的MCHID mch_id
        SSLContext sslcontext = SSLContexts.custom()
                .loadKeyMaterial(keyStore, CxpConstants.MCHID.toCharArray())//这里也是写密码的
                .build();
        // Allow TLSv1 protocol only
        sslsf = new SSLConnectionSocketFactory(
                sslcontext,
                new String[] { "TLSv1" },
                null,
                SSLConnectionSocketFactory.BROWSER_COMPATIBLE_HOSTNAME_VERIFIER);
    }catch (Exception e){
        e.printStackTrace();
        logger.error("init httpclient ssl exception", e);
    }
    client = HttpClients.custom()
            .setConnectionManager(cm)
            .setDefaultRequestConfig(requestConfig)
            .setRedirectStrategy(defaultRedirectStrategy)
            //当连接空闲五分钟的时候， 就会被断掉
            .evictIdleConnections(5l, TimeUnit.MINUTES)
            //启动一个后台线程去收集expired的connection
            .evictExpiredConnections()
            .setSSLSocketFactory(sslsf)
            .build();
}

public static String sendXmlPost(String url, String paramXml){
    logger.info(getTraceId() + "HttpUtil#sendXmlPost param: " + url + "    " + paramXml);
    HttpPost httpPost = new HttpPost(url);
    httpPost.setHeader(HTTP.CONTENT_TYPE,"application/xml; charset=UTF-8");
    StringEntity paramEntity = new StringEntity(paramXml,"UTF-8");
    httpPost.setEntity(paramEntity);
    try {
        CloseableHttpResponse response = client.execute(httpPost);
        if (response == null){
            logger.error(getTraceId() + "HttpUtil#sendXmlPost response is null================");
            return null;
        }
        if (response.getStatusLine().getStatusCode() == 200){
            String ret = EntityUtils.toString(response.getEntity(),"UTF-8");
            logger.info(getTraceId() + "HttpUtil#sendXmlPost response: " + ret);
            return ret;
        }
        logger.info(getTraceId() + " HttpUtil#sendXmlPost statusCode is " + response.getStatusLine().getStatusCode());
    } catch (IOException e) {
        e.printStackTrace();
        logger.error(getTraceId() + "HttpUtil#sendXmlPost exception: ",e);
    }
    logger.error(getTraceId() + "HttpUtil#sendXmlPost ret null================");
    return null;
}

=========================================Exception====================================

org.apache.http.NoHttpResponseException: api.mch.weixin.qq.com:443 failed to respond

at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:141)

at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:56)

at org.apache.http.impl.io.AbstractMessageParser.parse(AbstractMessageParser.java:259)

at org.apache.…….DefaultBHttpClientConnection.receiveResponseHeader(DefaultBHttpClientConnection.java:163)

at org.apache.http.impl.conn.CPoolProxy.receiveResponseHeader(CPoolProxy.java:165)

at org.apache.http.protocol.HttpRequestExecutor.doReceiveResponse(HttpRequestExecutor.java:273)

at org.apache.http.protocol.HttpRequestExecutor.execute(HttpRequestExecutor.java:125)

at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:272)

at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:185)

at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:89)

at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:111)

at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185)

at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83)

at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:108)

at com.cxp.server.common.util.HttpUtil.sendXmlPost(HttpUtil.java:120)

at com.cxp.server.service.wechat.WeChatPayService.execute(WeChatPayService.java:112)

at com.cxp.server.service.wechat.WeChatPayService.refund(WeChatPayService.java:75)

at com.cxp.server.control.TestControl.main(TestControl.java:58)