Why Tnsping Hang
sqlplus, tnsping or lsnrctl Hangs I can't cover all situations in this post, but I have some cases to share with you. Those hanging all… Read More »Why Tnsping Hang
DNS
How to Make Your Mail Trusted by Gmail and Yahoo Mail
Almost all free mail providers like Gmail and Yahoo Mail will filter out spam or spoofed emails by validating the source (SMTP server), if your… Read More »How to Make Your Mail Trusted by Gmail and Yahoo Mail
How to Resolve NameServer Persistency After Every Reboot
When we want to change DNS permanently in Linux, what will you do? I guess you will modify /etc/resolv.conf. But newer versions of Linux appear… Read More »How to Resolve NameServer Persistency After Every Reboot