Firewalld

How to Resolve ORA-12535: TNS:operation timed out

by Ed Chen
February 11, 2019April 6, 2022

ORA-12535 and TNS-12535 ORA-12535 is the same as TNS-12535, they all indicate that the connection between the client and the listener has been timed out.… Read More »

How to Limit Network Access By Firewalld on Enterprise Linux 7

by Ed Chen
March 19, 2016September 24, 2021

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 »