Trying pinging Google's DNS: 8.8.8.8 to see if you actually have or don't have a connection.
WOW's DNS server have been horrible for quite a while. I recommend running GRC's DNS Benchmark and finding some better servers around you. Be sure to use the customized list option that appears after you first run the benchmark.
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www.grc.com/dns/benchmark.htmYou can try using the server's IP: 4.79.142.200 if you can't get a DNS resolution.