Not sure if this has been addressed but I've looked at countless other repack threads/etc and I don't see issues with this but I am curious how to fix it.

In the past when I did my own private server with repacks I never had to have an actual internet connect. With cata it just gives me an error everytime regardless of the realmlist settings. Is there a way around this? I don't want to be connected to an ISP to play local.