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Oracle Tips by Burleson

Chapter 7 Oracle Network Security

allowed in the invited list. If this list is specified, then it takes precedence over the excluded list.

After making the change in protocol.ora (in Oracle 8i) or sqlnet.ora (in Oracle 9i and above), stop and restart the listener. The values take effect only during the startup of the listener. After this change, if a user, regardless of the authentication in the database or authority level, connects from the node enrollment1, he or she receives the error

$ sqlplus nathan/5ucc355@claimdb
SQL*Plus: Release - Production on Wed Jul 2 11:57:06 2003

Copyright (c) 1982, 2002, Oracle Corporation.  All rights reserved.

ORA-12537: TNS:connection closed

Enter user-name:
The error message is a little less intuitive It does not explicitly state the nature of the error.

The same user connecting from node CLAIMS1 will succeed. In this case, the listener simply rejects the connection originating from the node ENROLLMENT1, regardless of the user.

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