How to Make a WhiteList for DB Connectionby Ed ChenNovember 3, 2022November 18, 20222 CommentsDatabase 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
How to Limit ISCSI Initiator Name to Accessby Ed ChenSeptember 26, 2020November 22, 2022In 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 7by Ed ChenMarch 19, 2016November 10, 2022You 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 closedby Ed ChenNovember 8, 2012December 11, 20226 CommentsORA-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