VMware Error

When I try to access VM console I get the following error:

"Unable to connect to the MKS: Could not connect to the pipe. ... Failed to connect server"

I have tried various things like reinstalling vSphere 5.1,, Adding Host IP to Host File, Disabling firewall etc.. It did not help. Any advise towards a resolution will be appreciated.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
is this for a single VM, or all VMs ?

have you tried testing this from  another computer ?
cgeorgeisaacAuthor Commented:
Yes, tried from 3 different computers same error. The vms in question are on vSphere5.1 and I have no issues accessing vms on vSphere5.5 from the same computer. Thanks.
cgeorgeisaacAuthor Commented:
Sorry it is the other way round.  I am able to access all vms on vSphere5.1 but non from vSphere5.5.   I was able to access this   without any issues.  Tried various browsers too. No luck. Thanks.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
You mention browser ?

So are you using the Web Client ?
cgeorgeisaacAuthor Commented:
I tried vSphere  and  Web Client too.  Same error. Thanks.
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Okay this usually occurs,

1. firewall issue - disable firewall

2. DNS, forward and reverse resolution issue. - check you can ping, traceroute to vCenter Server hostname, fqdn, and server names.

3. VM Registration if just a single VM.

4. restart network management agents.

5. reboot host server

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cgeorgeisaacAuthor Commented:
I think you are right Andrew.
1. I am able to access the  VCenter and Hosts (I can do everything except launching VM consoles!)
2. However, I am unable to get ping replies from my vCenter, Hosts or VMs
3. This being our main production unit, I may have to involve my Network admin too (which I will do early next week)

Highly appreciate your assistance.
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
check your networking, and DNS, firewalls...
cgeorgeisaacAuthor Commented:
This being a production environment. We can try some of your suggestions only during weekend.  I am positive your suggestions will help me resolve the issue.  The incident may be treated as closed.  Thanks for your prompt attention to this matter. Cheers!
cgeorgeisaacAuthor Commented:
I've requested that this question be closed as follows:

Accepted answer: 0 points for cgeorgeisaac's comment #a40672139

for the following reason:

Excellent.  Very prompt and precise. Thanks for your professional help in this matter.
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
If these Answers have been helpful please assign points.
cgeorgeisaacAuthor Commented:
cgeorgeisaacAuthor Commented:
How to assign points? Sorry I am not too sure.  Full points to you.
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