ORA-12231: TNS:No connection possible to destination
Cause: This error is reported by an interchange which fails to find a possible connection along the path to the destination.
Action: Report the problem to your Network Administrator so that he may fix the problem.
1. 确保目标节点的IP地址和端口正确无误；
2. 检查TCP/IP协议的服务器上同时可以识别的服务是否与配置文件中的SID一致；
3. 确保从服务器到客户端之间没有防火墙或其他安全策略；
4. 最后，如果有其他相关的数据库连接，需要检查所有相关连接信息是否正确无误。