Upgrading OID from 10g to 11g

There is video clearly explaining the upgrade processs of OID 10g to 11g.

Metalink note: 1123963.1

TNS-12542: TNS Address already in use

While starting the Oracle DB 11g listener I am getting the error TNS-12542. Check the below screenshot.

The DB services are running in VM and network setting is applied as NAT. It was working all while until today so I verified the ip address and noticed that it is changed.
So I updated the /etc/hosts file with correct IP address and started the listener without any hiccups :)

Planning to move to other vendor products?????

With time I am getting chafed with Oracle Products and its documentation. Oracle is releasing products at a much faster rate with inadequate documentation and inadequate training programs. It is getting very difficult for programmers to adapt to new versions and implement the customer requirements.

I am planning to learn some other vendor products to shift the Oracle platform.. I can't assure whether I will quit Oracle platform.

So my next objective is to learn Novell Access Manager based on my bandwidth. I shall be writing some posts on my learning often.