[arch-general] Can't Connect to localhost/127.0.0.1 until I'm connected to a network

Hello, When I boot my computer the connection to the wifi network takes a while, until then I can't connect to localhost. So I can't use mpd for example, I musst either turn off my wifi card or wait until I'm connected. This is quite annoying, is there a way to solve that problem or at least get a better diagnosis for solving it on my own? Thomas