Sounds to me like a firewall issue, your browser is allowed through, but WAU and JWU isnt. If you have a firewall, check that it allows the updater your trying to use to connect to the internet.
Not using any firewall atm. Well the one on router, but afaik that one only blocks acces to ports, not programs or applications. And as I can easily download from wowace.com and other sites, I can tell you that the port isn't blocked :)
so what else could be wrong?
A guildie said he tried the same thing. and his got working agian by changing DNS. but this doesn't seem to work for me..