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
Whitelist
How to Limit ISCSI Initiator Name to Access
In iSCSI, we call clients as initiators. For allowing only specific initiators to access the target, we have to put all allowable initiators in the… Read More »How to Limit ISCSI Initiator Name to Access
How to Limit Network Access By Firewalld on Enterprise Linux 7
You may have noticed that the service ssh is also added in the public zone (/etc/firewalld/zones/public.xml) by default. This is necessary for initialization. But after… Read More »How to Limit Network Access By Firewalld on Enterprise Linux 7
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