我正在尝试从denodo平台访问配置单元，但是我收到以下错误消息
"Unable to establish connection: Could not open client transport with JDBC Uri: jdbc:hive2://hostname:portnumber: java.net.ConnectException: Connection refused: connect ".
以前使用相同的配置并且突然停止工作。在检查hive.log文件时，我发现了这个：
> ERROR [pool-3-thread-5]: server.TThreadPoolServer (TThreadPoolServer.java:run(294)) - Thrift error occurred during processing of message.
org.apache.thrift.protocol.TProtocolException: Missing version in readMessageBegin, old client?
at org.apache.thrift.protocol.TBinaryProtocol.readMessageBegin(TBinaryProtocol.java:228)
at org.apache.hadoop.hive.metastore.TUGIBasedProcessor.process(TUGIBasedProcessor.java:75)
at org.apache.thrift.server.TThreadPoolServer$WorkerProcess.run(TThreadPoolServer.java:285)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:748)
我重新启动了服务，Namenode的Safemode已关闭，远程服务器的防火墙已关闭，JDBC驱动程序已正确配置。
我无法调试日志文件，任何帮助都将不胜感激。