C#WebService连接数据库报错

[qq_29715381]

string connectionstring = "Data Source= (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = XXX.XXX.XXX.XXX)(PORT = XXXX)))(CONNECT_DATA =(SERVER = DEDICATED)(SID = XXXXX) ));User Id=XXXX;Password=XXXX";
OracleConnection conn = new OracleConnection(connectionstring);
conn.Open();
return "Hello World";

报错System.Data.OracleClient.OracleException: ORA-06413: 连接未打开

在 System.Data.OracleClient.OracleException.Check(OciErrorHandle errorHandle, Int32 rc)
在 System.Data.OracleClient.OracleInternalConnection.OpenOnLocalTransaction(String userName, String password, String serverName, Boolean integratedSecurity, Boolean unicode, Boolean omitOracleConnectionName)
在 System.Data.OracleClient.OracleInternalConnection..ctor(OracleConnectionString connectionOptions)
在 System.Data.OracleClient.OracleConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningObject)
在 System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnection owningConnection, DbConnectionPool pool, DbConnectionOptions options)
在 System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject)
在 System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject)
在 System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject)
在 System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection)
在 System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory)
在 System.Data.OracleClient.OracleConnection.Open()
在 WebApplication2.WebService1.HelloWorld() 位置 c:\users\administrator.k0oh56f1dzuxr7l\documents\visual studio 2010\Projects\WebApplication2\WebApplication2\WebService1.asmx.cs:行号 28


数据库都是正常的，换了台电脑是可以运行的，求各位大神帮忙解决

[非专业开发Five]

可能问题很多，先从网络环境开始，一步一步走。 网络环境 防火墙 oracle客户端 服务器端屏蔽

[lsj_zrp]

换台机器可以用，那就说明程序和数据库都没有问题 ，那就是这台机器的问题了