连接数据库错误The Network Adapter could not establish the connection
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排查错误过程
1. sqlplus 用system账号正常登陆进去
2. 运行 services.msc 看 OracleOraDb11g_home1TNSListener 是否开启，已正常开启
3. cmd -> netstate -na 有127.0.0.1 0.0.0.0 LISTENING
4. 安装目录app\Lynn\product\11.2.0\dbhome_1\NETWORK\ADMIN 打开listener.ora & tnsnames.ora 把其中的localhost字段改为127.0.0.1
问题解决
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