Oracle Error Message
CLSGN-00152: Self-check failed.
Reason for the Error
The self-check performed by GNS at initialization time failed.
Solution
Check the accompanying exceptions and the log and trace files for details as to why it failed. Also verify that DNS has been configured so that it contains a “forwarders” clause which contains the domain used by GNS and the IP address on which the GNS server is listening.