The domain may have kept old DNS setting and is therefore not pointing at the server that enables Web Forwarding. You view this by:-
1) Accessing the domain control panel for the domain
2) Click on "DNS Management".
3) The A records for web services on the domain should be 184.108.40.206 which is the server that carries out Web Forwarding. If they're not, click the 'click here' option under the 'Reset the DNS to default' heading. This will reset the DNS of the parked domain to the correct setting.
4) Please allow at least 24 hours for DNS changes to propagate.
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