Some of our ESX clusters have recently been upgraded to 5.1, and since doing so we have seen the following error logged every second in the Application Event Log on the guest servers while a user is logged on:

Source: VMware Tools
Type: Warning
Event ID: 1000

[warning] [vmusr:vmusr] Error in the RPC receive loop: RpcIn: Unable to send.

VMware_EventID_1000

A quick Google brought this article on the VMware site that contains to my attention:

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2036350

It basically suggests disabling logging for the VMware Tools so I suspect this is just a temporary workaround while they investigate the issue and release a fix.

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