java.net.ConnectException: Connect to XXXhost:XXXport failed: 拒绝连接 (Connection refused)
2022/4/11 20:42:33
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上周五夜间,服务端程序发版期间,客户端程序在通过http调用服务端接口时出现一堆 “拒绝连接 (Connection refused) ” 异常。
2022-04-08 22:22:28,676 ERROR [2022040822222771523885] ? (com.cn.yft.pay.util.HttpClientHelper:) - 请求urlParam 异常: org.apache.http.conn.HttpHostConnectException: Connect to 123.56.223.21:8280 [/123.56.223.21] failed: 拒绝连接 (Connection refused) at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:158) ~[httpclient-4.5.2.jar:4.5.2] at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:353) ~[httpclient-4.5.2.jar:4.5.2] at org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:380) ~[httpclient-4.5.2.jar:4.5.2] at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:236) ~[httpclient-4.5.2.jar:4.5.2] at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:184) ~[httpclient-4.5.2.jar:4.5.2] at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:88) ~[httpclient-4.5.2.jar:4.5.2] at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110) ~[httpclient-4.5.2.jar:4.5.2] at org.apache.http.impl.client.InternalHttpClient.doExecute$original$szvaDZwu(InternalHttpClient.java:184) ~[httpclient-4.5.2.jar:4.5.2] at org.apache.http.impl.client.InternalHttpClient.doExecute$original$szvaDZwu$accessor$2wpTSoQJ(InternalHttpClient.java) ~[httpclient-4.5.2.jar:4.5.2] at org.apache.http.impl.client.InternalHttpClient$auxiliary$f5vLomHg.call(Unknown Source) ~[httpclient-4.5.2.jar:4.5.2] at org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.InstMethodsInter.intercept(InstMethodsInter.java:86) ~[skywalking-agent.jar:8.6.0] at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java) ~[httpclient-4.5.2.jar:4.5.2] at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82) ~[httpclient-4.5.2.jar:4.5.2] at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:107) ~[httpclient-4.5.2.jar:4.5.2] at com.cn.yft.pay.util.HttpClientHelper.httpClientPost(HttpClientHelper.java:506) [pctrans-core-0.0.1-SNAPSHOT.jar:?] at com.cn.yft.bank.p600001.own.PaymentTransByOWN.doBusiness$original$a5alvy8U(PaymentTransByOWN.java:150) [pctrans-core-0.0.1-SNAPSHOT.jar:?] at com.cn.yft.bank.p600001.own.PaymentTransByOWN.doBusiness$original$a5alvy8U$accessor$RlW8FGim(PaymentTransByOWN.java) [pctrans-core-0.0.1-SNAPSHOT.jar:?] at com.cn.yft.bank.p600001.own.PaymentTransByOWN$auxiliary$GTU0SZKs.call(Unknown Source) [pctrans-core-0.0.1-SNAPSHOT.jar:?] at org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.InstMethodsInter.intercept(InstMethodsInter.java:86) [skywalking-agent.jar:8.6.0] at com.cn.yft.bank.p600001.own.PaymentTransByOWN.doBusiness(PaymentTransByOWN.java) [pctrans-core-0.0.1-SNAPSHOT.jar:?] at com.cn.yft.pay.service.PCPaymentRunnable.run(PCPaymentRunnable.java:50) [pctrans-core-0.0.1-SNAPSHOT.jar:?] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_191] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_191] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_191] Caused by: java.net.ConnectException: 拒绝连接 (Connection refused) at java.net.PlainSocketImpl.socketConnect(Native Method) ~[?:1.8.0_191] at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) ~[?:1.8.0_191] at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) ~[?:1.8.0_191] at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) ~[?:1.8.0_191] at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) ~[?:1.8.0_191] at java.net.Socket.connect(Socket.java:589) ~[?:1.8.0_191] at org.apache.http.conn.socket.PlainConnectionSocketFactory.connectSocket(PlainConnectionSocketFactory.java:74) ~[httpclient-4.5.2.jar:4.5.2] at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:141) ~[httpclient-4.5.2.jar:4.5.2] ... 23 more
参考csdn上网友的Connection refused: connect问题解决方案集合,整理一下http调用出现connection refused异常的各种情况:
客户端:
- 写错了主机和端口
- 通信协议不正确,http://,https://,rmi://
- 客户端服务不在网络中。它可能没有连接到LAN或互联网或任何其他网络。
- 客户端网络防火墙拦截请求
服务端:
- 服务挂掉了 / 服务未运行
- 服务在重启中 / 服务处于kill -15过程中
- 服务端网络防火墙拦截请求
- 服务端服务不在网络中。它可能没有连接到LAN或互联网或任何其他网络。
- 服务器正在运行但没有侦听端口,或者服务器正在运行但是正在侦听不同的端口。
简单测试一下上面的几种情况。结论是:上面总结的几种情况并不都返回connection refused异常。至少如下几种不是。
我司公司网络限制访问淘宝、优酷等视频购物网站。就拿访问淘宝网(https://www.taobao.com)来说, 我们来 curl https://www.taobao.com 或 curl http://www.taobao.com
C:\Users\zhangguozhan>curl https://www.taobao.com curl: (35) schannel: next InitializeSecurityContext failed: SEC_E_INVALID_TOKEN (0x80090308) - 给函数提供的标志无效
<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" / ><title>Forbidden</title> </head> <body> 你被禁止访问这个网站,请联系网站管理员! </body> </html>
把网络切换成自己手机的4G,再 curl https://www.taobao.com/, 此时可以正常返回响应结果。
然后,自己手机4G情况下,把上面的https换成http, 即, 此时,返回的是我们熟知的301(重定向)错误。
C:\Users\zhangguozhan>curl http://www.taobao.com <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"> <html> <head><title>301 Moved Permanently</title></head> <body> <h1>301 Moved Permanently</h1> <p>The requested resource has been assigned a new permanent URI.</p> <hr/>Powered by Tengine</body> </html>
以上,做个记录,方便日后工作中查证。
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