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ORA-28547: connection to server failed, probable Oracle Net admin error tips

Oracle Error Tips by Stephanie F.


The Oracle docs note this on the ORA-28547 error:

ORA-28547: connection to server failed, probable Oracle Net admin error

Cause: A failure occurred during initialization of a network connection from a client process to the Oracle server: The connection was completed but a disconnect occurred while trying to perform protocol-specific initialization, usually due to use of different network protocols by opposite sides of the connection.

This usually is caused by incorrect Oracle Net administrative setup for database links or external procedure calls. The most frequent specific causes are:

-- The connection uses a connect string which refers to a Heterogeneous Services agent instead of an Oracle server.

-- The connection uses a connect string which includes an (HS=) specification.  


Action: Check Oracle Net administration in the following ways:

-- When using TNSNAMES.ORA or an Oracle Names server, make sure that the client connection to the ORACLE server uses the correct service name or SID.

-- Check LISTENER.ORA on the connection end point"s host machine to assure that this service name or SID refers to the correct server.

-- Confirm in TNSNAMES.ORA or the equivalent service definition that the connect string does NOT contain (HS=).

Per Internet sources, ORA-28547 can occur on Oracle Net Services; version 10.1.0 to 10.2 when, "Oracle Native Authentication Services is failing Client sqlnet trace, level SUPPORT, shows the underlying error is a TNS-12631" causing "All connections to the database, including SYSDBA, fail with an ORA-28547"

To resolve ORA-28547, this document states that the following steps should be taken:

As a workaround disable Oracle Native Authentication Services. Change SQLNET.AUTHENTICATION_SERVICES from (NTS) to (NONE) in the server sqlnet.ora

As a solution change the database service to run as a user who is a member of the Domain Admin group. Oracle Log On user must be a privileged user to allow it to correctly authenticate the client user for Native Authentication.

1. Edit the properties of the database service, select the Log On tab

2. Select "This Account" and add you domain admin account details and click OK

3. Shutdown the database

4. Stop and restart the service



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