adding a host to vSphere 5.1 error timed waiting for vpxa to start

Hi,
I have configured a SSO server with vsphere, added a data-center but when attempting to add a host I keep getting the vpxa start timeout.
I found a VMware BK with the resolution is to change the buffer from 128 to 256 in the vpxa.conf file, this did not resolve the issue, any help would be appreciated.

Regards,
Atorex
atorexAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Is the ESXi host version 5.1  and not 5.5.
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atorexAuthor Commented:
its 5.5, was wondering if that is the issue!!!
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Yes, you cannot add 5.5 to vCenter 5.1.

You must have vCenter 5.5.

Your version of vCenter must always be higher than the host version.

Upgrade to vCenter 5.5.
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atorexAuthor Commented:
Thanks for the info
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
No problems...
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