VM goes out of network .

Hi ,

I have strange problem , some servers that are in DMZ network , after automatic migration , it losts network communication.
- cannot even ping
- after restart its same
When i migrate VM to another host it goes alive ...

I suspect from Firewall for some reason but , its hard to prove ...
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vmwarun - ArunCommented:
1.How many ESX Hosts do you have in a cluster ?
2.What type of storage are you using (NAS, iSCSI or FC SAN) ?
3.Is there a firewall between vCenter and ESX Hosts ?
JeanPoLAuthor Commented:
1. there is 4 hosts ...
2. SAN ( EVA )
3. No there is not .  
vmwarun - ArunCommented:
1.Have you enabled DRS or are you manually vMotioning them from one host to another ?
2.What version of ESX/ESXi (ESX 3, 3.5 or 4or ESXi 3.5 or 5) are you using ?
3.What version of vCenter are you using (2.5 or 4) ?
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JeanPoLAuthor Commented:
1.I have DRS enabled  
2.ESX 3.5
3.vCenter 2.5
JeanPoLAuthor Commented:
Note: During this problem i can log on to machine , as OS it works fine but its like all connections to outside is dead.

Have you checked all of your VM hosts networking to make sure that the DMZ network is configured correctly on all servers?

Are you using Distributed VSwitches or manually configured switches on each VM host?

If you manually vmotion the VM to the VM host that has the problem, do you lose network connectivity?
I know this sounds silly, but have you checked the settings of the VM itself and made sure the DMZ network adapter is showing a checkmark next to Connected?  I had a strange issue when I would migrate a VM it would keep the checkmark to connect at startup but not Connected.

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vmwarun - ArunCommented:
Out of the 4 hosts, if you have this issue on a single host, then you can isolate the issue and start checking the Networking policies at the Port Group level or at the VM Level.
JeanPoLAuthor Commented:
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