The cdw.com website has been offline for several hours now because their nameservers don't seem to exist anymore:

  $ dig +trace cdw.com
  ...
  couldn't get address for 'ns1.cdw.com': not found
  couldn't get address for 'ns2.cdw.com': not found
  dig: couldn't get address for 'ns1.cdw.com': no more

Shout out to their tech team, who are likely having a rough afternoon.