Hey, I sent in a request for the CD Key and did everyting the message asked me to, however I still cannot connect to online servers because I get booted out with the same old message requiring CD Authentication.
I put the cdkey ini file I recieved into the NWN folder and overwrote the old one, just like I was told.
Please help guys, multiplayer was the best part of NWN, do i need a newn CD Key or is something wrong?

Does this happen on every server you try to log onto? Or just one.
It does not sound like the CD-Key is the problem. It sounds like the server you are trying to log onto has the :

Master Server Authentication Required For Player Login=0

option set in there nwnplayer.ini file.

If it is set to 1 instead of 0, like the one I pasted above, you will not be able to log onto there server. The master server has been down for a long time now and will not give Authentication to anything anymore.

THe problem has been resolved.
It had been happening on every server, But I was given a new CD Key.
The problem, I discovered is that multiplayer accounts are tied to your CD Key, which I did not realise. I was trying to log in with my old accounts and got booted even with this new one.
I made a new account and it works fine.
Seems so obvious now.

Still experiencing the problem i cant actually reply to support emails without the email being bounced back