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

clopera used Ask the Experts™
We have a new server installation.
We running a lot of servers Windows 2008r2 in the Esxi 5.1 Vmware, some times the users say me that the RDP session it freeze for 10 seconds aprox. User connect with Cisco Ipsec Client for windows.
We found in the Aplication Event Viewer log this message:
"[ warning] [vmusr:vmusr] Error in the RPC receive loop: RpcIn: Unable to send."
Event ID1000And in the System Event Viewer log this message with the same time:
"The Terminal Server security layer detected an error in the protocol stream and has disconnected the client. Client IP: 192.168.xxx.xx."
Event ID 56
Any suggestion?
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It appears "fr0nk" has already give you the answer elsewhere to this KB (http://kb.vmware.com/kb/2036350), but anyway, related info here:

If no luck with that, more generally speaking, it can also be that this can be due to some of the more advanced network settings or the NIC driver.

Some suggestions here:

And someone here specifically with the issue under ESXi.  Note the suggestion about changing the virtual NIC type:
I'd go for the official VMware KB info first!

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