问题描述
节点进程起来后，同其他的节点连接失败。
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2017-11-14 08:03:36 connect() to 104.236.211.206:19335 failed after select(): Connection refused (111)
2017-11-14 08:03:37 connect() to 66.178.182.35:19335 failed after select(): Connection refused (111)
2017-11-14 08:03:38 connect() to 104.236.211.206:19335 failed after select(): Connection refused (111)
2017-11-14 08:03:39 connect() to 66.178.182.35:19335 failed after select(): Connection refused (111)
2017-11-14 08:03:40 connect() to 104.236.211.206:19335 failed after select(): Connection refused (111)
2017-11-14 08:03:41 connect() to 104.236.211.206:19335 failed after select(): Connection refused (111)
2017-11-14 08:03:42 connect() to 66.178.182.35:19335 failed after select(): Connection refused (111)
2017-11-14 08:03:43 connect() to 66.178.182.35:19335 failed after select(): Connection refused (111)
2017-11-14 08:03:44 connect() to 66.178.182.35:19335 failed after select(): Connection refused (111)
2017-11-14 08:03:44 connect() to 66.178.182.35:19335 failed after select(): Connection refused (111)
2017-11-14 08:03:45 connect() to 104.236.211.206:19335 failed after select(): Connection refused (111)
2017-11-14 08:03:46 connect() to 104.236.211.206:19335 failed after select(): Connection refused (111)
2017-11-14 08:03:47 connect() to 104.236.211.206:19335 failed after select(): Connection refused (111)
2017-11-14 08:03:48 connect() to 66.178.182.35:19335 failed after select(): Connection refused (111)
2017-11-14 08:03:49 connect() to 104.236.211.206:19335 failed after select(): Connection refused (111)
2017-11-14 08:03:50 connect() to 66.178.182.35:19335 failed after select(): Connection refused (111)
2017-11-14 08:03:51 connect() to 104.236.211.206:19335 failed after select(): Connection refused (111)
2017-11-14 08:03:52 connect() to 104.236.211.206:19335 failed after select(): Connection refused (111)
2017-11-14 08:03:53 connect() to 104.236.211.206:19335 failed after select(): Connection refused (111)
2017-11-14 08:03:54 connect() to 104.236.211.206:19335 failed after select(): Connection refused (111)
2017-11-14 08:03:55 connect() to 66.178.182.35:19335 failed after select(): Connection refused (111)
2017-11-14 08:03:56 connect() to 66.178.182.35:19335 failed after select(): Connection refused (111)
2017-11-14 08:03:57 connect() to 66.178.182.35:19335 failed after select(): Connection refused (111)
2017-11-14 08:03:58 connect() to 104.236.211.206:19335 failed after select(): Connection refused (111)
2017-11-14 08:03:59 connect() to 104.236.211.206:19335 failed after select(): Connection refused (111)
2017-11-14 08:04:00 connect() to 66.178.182.35:19335 failed after select(): Connection refused (111)
2017-11-14 08:04:01 connect() to 104.236.211.206:19335 failed after select(): Connection refused (111)
2017-11-14 08:04:02 connect() to 66.178.182.35:19335 failed after select(): Connection refused (111)
2017-11-14 08:04:02 connect() to 66.178.182.35:19335 failed after select(): Connection refused (111)
2017-11-14 08:04:03 connect() to 66.178.182.35:19335 failed after select(): Connection refused (111)
2017-11-14 08:04:04 connect() to 66.178.182.35:19335 failed after select(): Connection refused (111)
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这样导致比特币或者莱特币帐本不能同步到本地，同时交易也无法发出，节点无法工作。
问题原因
问题原因直接是本地节点与其他节点建立TCP连接建立失败。连接建立失败的原因有很多种，这里列举如下：
- 对端拒绝连接，如建立连接太多
- 中间网络设备作NAT导致
- 网络报文遇到攻击与修改
由于这些原因都不是本节点的原因，属于外部不可控的因素，所以不能希望找到上面的具体原因来解决问题。
解决办法
先了解一下bitcoin比特币节点之间如何建立连接。
这里第一个遇到问题，这些需要连接的节点有哪些来源？
- 地址数据库peers.dat
- 用户指定地址
- DNS查找
- 代码编码指定
- 其他节点的分享
了解这些，可以通过第2种方式来解决问题，在对应的bitcoin.conf文件中添加如下内容，指定一些已被验证的节点,具体如下：
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addnode=217.16.185.175
addnode=85.214.213.86
addnode=90.252.217.49
addnode=107.170.17.56
addnode=45.33.107.92
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重启节点即可。
（end）
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