Cannot connect to Vsphere Webclient

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http://serverfault.com – I have a problem connection to the VCenter Web Client. I can connect and do some administration from the VLAN that the Vcenter server is on and this is working fine. But if I connect from our client computers VLAN I can connect to the Vcenter server and see the welcome page but as soon as I click on the Log in on the right (Redirect to :9443/vsphere-client/ ) this just times out. it’s not a VLAN routing issue as first thought as I can connect to the Vcenter server from this VLAN via the Vsphere client. I have looked in the security profile of the hosts and the Vcenter IP isn’t restricte (HowTos)