Unable to connect to a ESXI server via Vsphere client.

I'm unable to connect to my ESXi server using Vsphere client. The client is installed on a XP machine (Version 5) and ESXI is 5.1.0

I can ping the ESXi server from the xp machine. And I can connect with another PC (windows 7 installed) but not with the XP PC

Error when attempting to connect  -

AN UNKNOWN CONNECTION ERROR OCCURED. THE REQUEST FAILED BECAUSE THE CLIENT COULD NOT VALIDATE THE SERVERS SSL CERTIFICATE (THE UNDERLYING CONNECTION WAS CLOSED; COULD NOT ESTABLISH TRUST RELATIONSHIPS FOR THE SSL/TLS SECURE CHANNEL?))

Any assistance would be appreciated.
APC_40Asked:
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Steve MCommented:
Have a look at this article:
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2011834

To resolve this issue, install/reinstall Microsoft .NET Framework 3.5 Service Pack 1 or later.

Cheers,
Steve
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
can you connect via IP Address or FQDN?

can you test the following:-

telnet <ip address> 80

telnet <ip address> 443

telnet <ip address> 902

if you connect via a browser to http://<ip address> do you get the vSphere ESXi web page?
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APC_40Author Commented:
I tried to access via the browser but it failed.

I only tried connecting via the IP address and not the name.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
are you sure you have the correct IP Address?

any firewalls in the way?

what are the results of the telnet tests?
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Steve MCommented:
APC_40 - any update on this issue you were having?
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APC_40Author Commented:
Good trouble shooting tips all round. I re-installed .net and it seemed to do the trick but I think our network team also configured something - thanks anyway.
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