unable to add powershell host to vco using kerberos

I am trying to add powershell host to vco but keep getting this error

I followed this doc on creating the krb5.conf on myu vco appliance. I rebooted it.

http://blog.mwpreston.net/2013/12/12/kerberos-authentication-for-the-powershell-plugin-in-vco-5-5/

https://blogs.vmware.com/orchestrator/2012/06/vco-powershell-plugin-how-to-set-up-and-use-kerberos-authentication.html

the error in vco is

send message on http://pshost:5985/wsman error , document in <?xml version="1.0" encoding="UTF-8"?>

<env:Envelope xmlns:env="http://www.w3.org/2003/05/soap-envelope">

  <env:Header>

    <a:To xmlns:a="http://schemas.xmlsoap.org/ws/2004/08/addressing">http://pshost:5985/wsman</a:To>

    <a:ReplyTo xmlns:a="http://schemas.xmlsoap.org/ws/2004/08/addressing">

      <a:Address mustUnderstand="true">http://schemas.xmlsoap.org/ws/2004/08/addressing/role/anonymous</a:Address>

    </a:ReplyTo>

    <w:MaxEnvelopeSize xmlns:w="http://schemas.dmtf.org/wbem/wsman/1/wsman.xsd" mustUnderstand="true">153600</w:MaxEnvelopeSize>

    <a:MessageID xmlns:a="http://schemas.xmlsoap.org/ws/2004/08/addressing">uuid:39F5560E-6C31-4F3B-A203-CA9EC353D895</a:MessageID>

there is no firewall blocking 5985

any idea?