vsphere cannot contact the specified host

I have a vmware 4.1 managed by vsphere 4.1 several of my host's show disconnected when trying to reconnect I get a specified host not responding. I removed one from inventory but no luck adding that host back. Each of the host's can be managed by the vsphere client software just fine so I am assuming that it is a vcenter issue any help would be appreciated.
Thanks
Chris
cclantonAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
restart network management agents on the host.

restart vCenter Server service on the vCenter server.
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IanThCommented:
do you see a green or maybe amber led (activety) on the affected host

is the host a blade server
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cclantonAuthor Commented:
Sorry should have included that the management service had been restarted on all machines so no joy on that avenue.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Check you have no storage issues, no iSCSI or FC LUNs added or removed, this can cause Host issues.

Missing datastores.
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cclantonAuthor Commented:
The host that I slicked does not show correct storage but the other two which I am trying to reconnect have identical storage/networking showing in the local host each is currently running vm's which are operating correctly.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
no path or storage changes on storage network, and no one has issued a Rescan Storage or Refresh datastores
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cclantonAuthor Commented:
No storage changes but I have probably run a rescan storage since this began.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
It's possible this issue is caused by storage changes, we can cause the issue you our experiencing.

Restart Hosts with issues.
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cclantonAuthor Commented:
One other piece of information I can add when trying to reconnect to the host's it gives me the same error if I use an incorrect password, like it's not even getting to the authenication point
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Yes, Host is broke, we've seen this alot, and VMware still seem to have not fixed this issue, if storage changes, and cause the host to become non-reponsive.
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cclantonAuthor Commented:
Is there a resolution to this situation ?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Reboot host, raise Support Request with VMware Support, and request a fix.

You are not the only site that has experienced this issue, it it is storage related.

No update or patch that we are aware of.
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cclantonAuthor Commented:
Switch issue seeing multiple macs ID's comming from the physical nics. turned port security off fixed problem
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cclantonAuthor Commented:
Solution presented itself after reboot of entire system and differnt VM's were visible.
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