Overview
I want to replace Oracle.DataAccess with Orcale.ManagedDataAccess, but opening a connection with the latter throws an ORA-12537 network session end of file exception.
Exception message / stack trace
{OracleInternal.Network.NetworkException (0x000030F9): ORA-12537: Netzwerksession: Dateiende at OracleInternal.Network.ReaderStream.Read(OraBuf OB) at OracleInternal.TTC.OraBufReader.GetDataFromNetwork() at OracleInternal.TTC.OraBufReader.Read(Boolean bIgnoreData) at OracleInternal.TTC.MarshallingEngine.UnmarshalUB1(Boolean bIgnoreData) at OracleInternal.TTC.TTCProtocolNegotiation.ReadResponse()}
I am trying to connect to a Oracle 11g database and do not have a client installed on my local machine.
Working test application (unmanaged)
Using Oracle.DataAccess works fine.
using System;
using Oracle.DataAccess.Client;
namespace App.Odp.Unmanaged
{
internal class Program
{
private static void Main(string[] args)
{
//dummy connection string. using SID
string connectionString = "User Id=***;password=***;Data Source=1.2.3.4:1521/sid01;";
try
{
using (var conn = new OracleConnection(connectionString))
{
conn.Open();
using (OracleCommand cmd = conn.CreateCommand())
{
cmd.CommandText = "select * from all_users";
using (OracleDataReader reader = cmd.ExecuteReader())
{
Console.WriteLine("VisibleFieldCount: {0}", reader.VisibleFieldCount);
Console.WriteLine("HiddenFieldCount: {0}", reader.HiddenFieldCount);
}
}
}
}
catch (Exception ex)
{
Console.WriteLine("Error:{0}", ex.Message);
}
Console.ReadLine();
}
}
}
References and dependencies
- Oracle.DataAccess (2.111.7.0)
- oci.dll (11.1.0.1)
- orannzsbb11.dll (11.1.0.6)
- oraociei11.dll (Oracle Call Interface Instant Client)
- OraOps11w.dll (2.111.7.0)
Project settings
Plattform target x86
Target Framework 4.5
Failing test application (managed)
Using the nuget package Official Oracle ODP.NET, Managed Driver 12.1.21
Code is identical to above. Only change:
using System;
using Oracle.ManagedDataAccess.Client;
//... rest the same as above
References and dependencies
Only:
- Oracle.ManagedDataAccess (4.121.2.0)
Project settings
Plattform target Any CPU
Target Framework 4.5
App.config
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<configSections>
<section name="oracle.manageddataaccess.client" type="OracleInternal.Common.ODPMSectionHandler, Oracle.ManagedDataAccess, Version=4.121.2.0, Culture=neutral, PublicKeyToken=89b483f429c47342" />
</configSections>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
</startup>
<system.data>
<DbProviderFactories>
<remove invariant="Oracle.ManagedDataAccess.Client" />
<add name="ODP.NET, Managed Driver" invariant="Oracle.ManagedDataAccess.Client" description="Oracle Data Provider for .NET, Managed Driver" type="Oracle.ManagedDataAccess.Client.OracleClientFactory, Oracle.ManagedDataAccess, Version=4.121.2.0, Culture=neutral, PublicKeyToken=89b483f429c47342" />
</DbProviderFactories>
</system.data>
<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<dependentAssembly>
<publisherPolicy apply="no" />
<assemblyIdentity name="Oracle.ManagedDataAccess" publicKeyToken="89b483f429c47342" culture="neutral" />
<bindingRedirect oldVersion="4.121.0.0 - 4.65535.65535.65535" newVersion="4.121.2.0" />
</dependentAssembly>
</assemblyBinding>
</runtime>
<oracle.manageddataaccess.client>
<version number="*">
<dataSources>
<!--<dataSource alias="MyDataSource" descriptor="(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=1.2.3.4)(PORT=1521))(CONNECT_DATA=(SID=sid01)))" />-->
</dataSources>
<settings>
<!--<setting name="SQLNET.AUTHENTICATION_SERVICES" value="NTS"/>-->
</settings>
</version>
</oracle.manageddataaccess.client>
</configuration>
I have tried different settings (NTS, none, all) and changed the connection string to User Id=XXX;password=XXX;Data Source=MyDataSource;, but the error stays the same.
Questions
- What could be causing the ORA-12537 network session end of file exception?
- Is a reference / dependency missing?
- Does something have to be configured on the DB server?
UPDATE
On the server we are getting an ORA-12679: Native services disabled by other process but required error in the alert.log.
It seems to have something to do with the encryption. Commenting out the following lines in the servers sqlnet.ora solves the issue.
#SQLNET.AUTHENTICATION_SERVICES=(NTS)
#SQLNET.ENCRYPTION_TYPES_SERVER = (rc4_128, rc4_256)
#SQLNET.ENCRYPTION_SERVER=REQUIRED
#ENCRYPTION_WALLET_LOCATION=
# (SOURCE=(METHOD=FILE)(METHOD_DATA=
# (DIRECTORY=...\%ORACLE_SID%\wallet)))
New question
How do we configure ManagedDataAccess so it works with the encryption?
Update 2
Seems to work now with ODP Managed Driver 12c:
https://www.nuget.org/packages/Oracle.ManagedDataAccess/
Edit: ASO is now supported. Upgrade to ODAC 12c Release 4 or later. If this does not fix your problem, check the alert.log on the database server and investigate (google) any errors that occur there when you attempt to connect.
Original Answer:
As of this writing (4/30/15) there is no support for Oracle Advanced Security Option (ASO) encryption with ODP.NET Managed Driver which is what is causing your errors.
This is very likely to be supported at some point in the future so if you are reading this at a later date, check the latest ODP.NET docs to see if an upgrade of ODP.NET is needed.
http://docs.oracle.com/cd/E56485_01/win.121/e55744/InstallConfig.htm#CHDJIDIG
As of October 5th, 2015, the Oracle.ManagedDataAccess driver (ODAC 12c Release 4) supports ASO.
https://apex.oracle.com/pls/apex/f?p=18357:39:18138408495219::NO::P39_ID:28201
Make sure that you do not have older versions of Oracle.ManagedDataAccess in the GAC. It seems that several versions of the dll have the same AssemblyVersion.
I had an older version in the CLR 4 GAC (C:\Windows\Microsoft.NET\assembly\GAC_MSIL for me) that got installed with a Oracle 12.1-client.
Since dll:s in the GAC always are used first the old ASO-uncapable version was used, but I thought that I used the newer version.
Solution was to uninstall the older version from the GAC. The first installation step in the 12.1.2400 Nuget Package Readme-file is to "Un-GAC and unconfigure any existing assembly".
I too struggled with this error. Finally i tried with Oracle.ManagedDataAccess.dll for 12c (Version 4.122.1.0). Created a reference for above dll from the ODAC installed directory (\odp.net\managed\common), it worked...!!! Sharing my solution.
Had some of the same problems. Found an entry in the registry: HKEY_LOCAL_MACHINE\SOFTWARE\wow6432\oracle. If this part contains a ODP.NET.managed entry, possible with another key (name version dependend) check if this entyr contains a string called TNS_ADMIN. This string should be deleted or the value changed to a not existing directory. If the string exists and point to a valid directory the Managed Client does not use the setting from the configuration file and fails. Further investigation should be used, but I got my stuff working, and must postpone the rest....
I had was getting this error, and it was a simple case that my query that I was running had a mistake.
来源：https://stackoverflow.com/questions/29847444/odp-net-oracle-manageddataaccess-causes-ora-12537-network-session-end-of-file