This isn't important if you use the launcher some DM provided a while back or if you auto-connect through nwn, but if, like me, you don't then it can get annoying to have to wait for the "waiting on master server" message to time out every time.
I found this on the CoA forums and it works fine for me:
http://coa.ender.com/forum/viewtopic.php?f=2&t=146390&sid=aca4cd6e00b6e600c89886cbe7f749f7
Basically, append "0.0.0.0 nwmaster.bioware.com" to your "c:\windows\system32\drivers\etc\hosts" file.
Not responsible if you screw up! Check the link for more details. All credit goes to dude from CoA.
This is frankly amazing. I feel someone just removed a thorn that had been stuck in my nwn feet for far too long and I'm ready to grant them three wishes.