Solution found, guys.
Go to C-->Windows-->System32-->drivers-->etc
There you will see a file named host. Double click on it to open. If windows ask you which program to use to open this file, use notepad and copy and paste inside the following
80.82.78.6 pornolab.net
80.82.78.6 static.pornolab.net
89.248.162.149 bt.pornolab.net
and then save. Now pornolab.net must work. Thats what i did and it is working for me now.
I think it is an issue with DNS
thanks a lot .it works