Make it Top: Environment Variables:
Add 14021 port in firewall.
Here I, Muhammad Abdullah Al Noor,OCP will provide Basic Tricks and Tips on Oracle Technology. I have been working with Oracle Technology since 2002. At 1st I learnt Oracle 8i, Then I worked with Oracle 8i, 9i, 10g, 11g and then in 12C. I continuously worked with Oracle Developer 6i, 10g Developer Suite, 11g Fusion Middleware. I worked with Oracle Apex also. I have switched 3 companies and now I established a Training center and a Software Development company.