Fix issues with connection on port 1521 and 5500 with Oracle SQL Developer and Oracle Instant client

Fix issues with estabilishing a connection on port 1521 with Oracle SQL Developer and instant client

01:12 Connection error issues to Oracle Database 21c from Oracle Instant client and Oracle SQL Developer.
02:20 Solution to the problem by adding firewall for the port 1521, 5500
03:24 Testing back the connection after adding the firewall rulle.
04:24 Removing port 5500 to test Oracle Enterprise manager access error from remote client
07:00 Test the remote access error by disabling the firewall rule.

Some important software download links related to this video

Oracle SQL Developer without JRE for Windows 10 64 bit :

Oracle SQL Developer for Linux (RMP)

Other Platforms (Including Ubuntu) no installation required