Welcome to the forums.
We have a couple of test servers with different versions of maps that are not available to the public yet. Perhaps you were trying to connect to one of these?
Click
here to see a list of servers for WQ3. You should be able to connect to all of these
except for Kowboj, Wasteland-Testing, and Test Server. If you have the same trouble with any of the other servers then you have somehow made a mistake with your WQ3 installation. Please let us know if you need more help.