cannot add ESXi 6.0 host to vCenter 6.0

Hi Guys,
I am having an issue where I cannot add any ESXi 6.0 host to vCenter 6.0. I can add an ESXi 5.5 without issue.

I the error I am getting in the vpxd log is:

2015-06-18T16:36:37.312+01:00 info vpxd[03624] [Originator@6876 sub=vpxLro opID=120602ca] [VpxLRO] -- BEGIN task-internal-69093 -- datacenter-26 -- vim.Datacenter.queryConnectionInfo -- 524f7656-a68d-ef60-05e7-f24ec8a5f1b5(52359e42-f098-7b77-bc82-0cff38aa6ff9)

2015-06-18T16:36:37.314+01:00 error vpxd[04352] [Originator@6876 sub=HttpConnectionPool-000001] [ConnectComplete] Connect failed to <cs p:0000000008c8bfb0, TCP:192.168.0.12:443>; cnx: (null), error: class Vmacore::Ssl::SSLException(SSL Exception: error:140000DB:SSL routines:SSL routines:short read)

2015-06-18T16:36:37.314+01:00 error vpxd[03624] [Originator@6876 sub=httpUtil opID=120602ca] [HttpUtil::ExecuteRequest] Error in sending request - SSL Exception: error:140000DB:SSL routines:SSL routines:short read

I can ping and resolve all ESXi host and have checked the SSL certs and they look good as well.

Any help would be appreciated

Regards Dougie