Console stopped working for VM in vSphere client


I have been accessing a VM on a host via the vSphere console with no issues and a few minutes ago started getting the following error when I tried to bring it up:

Unable to connect to the MKS: Login (username/password) incorrect.

I googled this and the references really didn't apply to this situation.  This is on Esxi 5.5.0 and the host VM OS is W2008 R2.  After rebooting the VM I am able to get in to it via the Remote Desktop Connection client.


Ben ConnerCTO, SAS developerAsked:
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Ben ConnerCTO, SAS developerAuthor Commented:
I use IP addresses to access the host in this case (10.0. range).  No, no DNS changes have been made.  It was working 2 hours ago and now is not.

The VM version is vmx-09.

Ben ConnerCTO, SAS developerAuthor Commented:
Oh..  other VMs on that host I can access in the console tab with no issues.

Have you tried to access the vm via the web portal and the vSphere Client?
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is this the solution you found?

Open /etc/vmware/config with a text editor.
Add this: vmauthd.server.alwaysProxy = “TRUE”

Check your firewall config/network setup. This error is caused by your vSphere client not able to communicate with the ESX/ESXi host directly.

All “Unable to connect to the MKS:” errors are network issues. Do not be fooled by the mention of certificate issues…
Ben ConnerCTO, SAS developerAuthor Commented:
Haven't tried the web interface.  Trying that now.

I'm puzzled that it would work with one VM on the same host/switch and not this one, and this one was working about an hour ago.

Will let you know how the web ui goes.

I would also check the firewall settings on the Win2k8 Server.
Ben ConnerCTO, SAS developerAuthor Commented:
It's disabled.

Interesting.  The web UI can see the machine.

Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
this can happen if you have many console sessions open.

can you repeat the issue ?
Ben ConnerCTO, SAS developerAuthor Commented:
Certainly.  I am in vSphere client 5.5, accessing a single VM on a host.  Hm...ok, that's interesting.

There was a vmware-clientintegrationplugin-5.5.0 that the web UI wanted installed, so I did.  Now the VM is visible in the console in vSphere.  

Not sure why it suddenly stopped working w/o the plugin, but it is working now.

Thanks, guys!


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No problem, Please be sure to mark this question solved!
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
select your own question as the answer.
Ben ConnerCTO, SAS developerAuthor Commented:
Stumbled across the answer while I was working with others.  It may help someone else in the future.

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