Centos web server, 123-reg domaina nd DynDNS standard - cannot access site from domain, only IP

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http://serverfault.com – How to configure a 123-reg domain with DynDNS and a linux server? Hi, I've just set up a CentOS web server running lamp, purchased a domain from 123-reg and have signed up for DynDNS standard. I'm really confused how I get the domain to link in with Dyn. The client updater is working fine and I can access the website from the public IP, but whenever I go to the domain it just tells me it's a 123-reg domain. Does anyone know how I can resolve this? Thank you :) Btw, I'm running a dynamic IP (HowTos)