Vcenter Server not accessible


 Wonder if you can help.   I got my Vcenter server not accessible from  Remote Desktop non from my Vsphere client at my laptop.
 Friday was working fine and came this Monday and it just not accessible neither able to ping it.
the odd part is that all my VM server with in the same host that Vcenter is living, are working perfectly.
Any Ideas what would be the reason and solution.
Using Vsphere and  ESXi ver. 5.5
Oscar R. MuroAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Okay, so you cannot

1. RDP to your vCenter Server which uses 3389 TCP via RDP ?
2. Cannot access vCenter Server using vSphere Client ?
3. Cannot ping it?

So maybe you should connect directly to the ESXi host using vSphere Client, Open a Console to vCenter Server, and check the VM is Powered on and responding. At present it would suggest it's hung, stopped, powered off.

Otherwise restart it, Power off and Power On.

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Oscar R. MuroAuthor Commented:
Thank you,
 The tried the RDP, Vsphere Client and ping it, none of those worked.
I used Vshpere client to connect directly to host and i did see the Vcenter server there in power on but with no networking capability.
I restart the Vcenter and everything work just great.  Checked the logs and indicates that lost security with Domain Controller, no idea why, but i will find out.

Thanks for you suggestion Andrew.
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