Can't connect VMware 5.5 host to vCenter

I have a remote VMware 5.5 host which I am trying to connect to my head office vCenter server.
The vCenter server is version 5.1.
The remote host is accessible via the site to site VPN and all traffic is allowed over this VPN.
When I try and add the host it asks for credentials and gets all the way through the wizard.
It will then time out after a few minutes.
LVL 12
nealerocksAsked:
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Neil RussellTechnical Development LeadCommented:
You need vcenter 5.5 to manage 5.5 hosts.
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nealerocksAuthor Commented:
Simple answer.
Thanks for that!
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