Oracle Database B10772-01 Administrator's Manual page 187

To set the SSL version for the server:
Navigate to the SSL tab of the Oracle Advanced Security window in Oracle Net
1.
Manager, and select Configure SSL for: Server.
In the Require SSL Version: list, the default is Any. Accept this default or select
2.
the SSL version you want to use.
Choose File > Save Network Configuration.
3.
If you chose Any, then the sqlnet.ora file is updated with the following
entry:
SSL_VERSION=UNDETERMINED
SSL 2.0 is not supported on the server side.
Note:
Step 5: Set SSL Client Authentication on the Server (Optional)
The SSL_CLIENT_AUTHENTICATION parameter in the sqlnet.ora file controls
whether the client is authenticated using SSL. The default value is TRUE.
You must set this parameter to FALSE if you are using a cipher suite that contains
Diffie-Hellman anonymous authentication (DH_anon). Also, you can set this
parameter to FALSE for the client to authenticate itself to the server by using any of
the non-SSL authentication methods supported by Oracle Advanced Security, such
as Kerberos or RADIUS.
To set SSL_CLIENT_AUTHENTICATION to FALSE on the server:
Navigate to the SSL tab of the Oracle Advanced Security window in Oracle Net
1.
Manager, and select Configure SSL for: Server. The Oracle Advanced Security
SSL window for server configuration appears (Figure
Configuring Secure Sockets Layer Authentication 7-21
Enabling SSL
7–4).