My first thought on this is to suggest that there may be a firewall at work. LVS does some fancy encapsulating of packets, and when we first set up our new firewall it was dropping anything sent from the LVS server as badly formed. It could be that either the firewall on the individual Webwork servers is blocking these packets, or the client computer is dropping the packets because of the encapsulation.
We ran for a whole year on LVS without anyone complaining of such issues, so beyond that I don't have any immediate ideas.
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