How to Make a WhiteList for DB Connection
Database Whitelist If there's only a few clients that use the database, we can make a whitelist to explicitly accept those clients. We take 2… Read More »How to Make a WhiteList for DB Connection
TCP.VALIDNODE_CHECKING
How to Make a BlackList for DB Connection
Database Blacklist Unexpected connections may be seen in your listener log, we can make a blacklist to explicitly block those clients. We take 2 steps… Read More »How to Make a BlackList for DB Connection
How to Resolve ORA-12537:TNS:connection closed
ORA-12537 Overview There're several possible causes to raise ORA-12537: Incorrect File Permission White or Black List ORA-12537 Caused by Incorrect File Permission Incorrect file permission… Read More »How to Resolve ORA-12537:TNS:connection closed