To use Kerberos authentication to connect to Oracle source or target databases, you must place some required configuration files on the Secure Agent machine and set some environment variables.
When you configure Kerberos authentication to connect to Oracle, consider the following guidelines:
•The Secure Agent and database server that you use must be registered in the KDC server.
•You can't add more than one KDC to a krb5.conf file. Multiple KDCs are not supported.
•You can't generate a credential cache file for more than one Kerberos principal user.
•Kerberos cross-realm authentication is not supported.
•The environment variables you define for Kerberos authentication must be consistent with the entries in the Oracle sqlnet.ora and tnsnames.ora files.