There have been many posts here about "Can't assign requested address", it means that server is unreachable to anyone. (prolly the admins have set to it to dns to a non-existant IP number). If you are trying to connect to random server, try connecting to a specific server on that network that you know is linked. Most networks will have a list of current servers on their website, try some of them (be aware that the list isnt a guarantee all of those listed are linked at any particular moment in time)
