Article ID: 178391 - Last Review: December 3, 2003 - Revision: 3.1

PRB: Oracle TNS: Authentication Service Initialization Error

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This article was previously published under Q178391
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SYMPTOMS

Oracle databases authenticate users that are logged on with SQL*Net Authentication services. This service works fine for users logged into Oracle through SQLPlus; however, when the logged on user is a service like Internet Information Server, the authentication fails with the following error:
[Microsoft][ODBC driver for Oracle][Oracle]ORA-12641: TNS:authentication service failed to initialize
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CAUSE

This is a known limitation of SQL*Net Authentication.
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RESOLUTION

The problem may be corrected by editing the Sqlnet.ora file. This configuration file is usually stored in the Network/Admin subdirectory of the Oracle Home directory. The following line needs to be added to this file: 
SQLNET.AUTHENTICATION_SERVICES = (none)
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STATUS

Microsoft is researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.
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APPLIES TO
  • Microsoft Open Database Connectivity 2.0
  • Microsoft Open Database Connectivity 2.0
  • Microsoft Open Database Connectivity 2.0
  • Microsoft Open Database Connectivity 2.5
  • Microsoft Data Access Components 2.0
  • Microsoft Data Access Components 2.1
  • Microsoft Data Access Components 2.5
  • Microsoft Data Access Components 2.6
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Keywords: 
kb3rdparty kbdatabase kbdriver kboracle kbprb KB178391
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