Unable to view the VM console through vSphere console

is there any reason why the VMware console is failing in this case ?

I cannot view this one particular VM only after I upgraded to VCenter:

Error in vSphere console
LVL 9
Senior IT System EngineerIT ProfessionalAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
what version did you upgrade from and to?

do you have any anti-virus, try disable?

firewall disabled?
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Senior IT System EngineerIT ProfessionalAuthor Commented:
It was from 4.1 into 5.1 inLine.

Yes there is Symantec endpoint protection 12.1
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Have you tried to disable Anti-Virus?
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Senior IT System EngineerIT ProfessionalAuthor Commented:
somehow it works mysteriously after rebooting the VM ?
not sure what's happening with that instance before.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Sometimes commuinications can fail between VMs consoles.
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