Per this bug details, it was first found in Unity 4.0(3) and fixed in 4.0(3.86). I am running a Unity server with ver 4.0(5), but I am getting the error messages with point to this bug ID. Was the fix not carried into the successive releases?
The fix was definitely carried forward. From the bug release notes you can see "the problem occurs after the GAL (Global Address List) search returns an error when a subscriber addresses a message." Well, from 4.0(3.86) and onward we no longer us the GAL to resolve names so the problem went away. If you're seeing similar symptoms in 4.0(5) then something else is going on. A TAC case to diagnose the problem might be your best bet.
-Eric
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