Firewalld

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

by Ed Chen
February 11, 2019September 16, 2020

TNS-12535 First, let’s see how we reproduce TNS-12535. C:\Users\ed>tnsping compdb TNS Ping Utility for 64-bit Windows: Version 12.1.0.1.0 - Production on 22-JUL-2014 19:03:21 Copyright (c)… Read More »

How to Limit Network Access By Firewalld on Enterprise Linux 7

by Ed Chen
March 19, 2016September 10, 2020

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 »