Solved! Go to Solution.
When you look at the error message generated in the event log it should give you a URL. Does this URL point to localhost or the evservers DNS Alias?
This type of issue is either pretty easy to fix or can be an absolute minefield where information is missing, for example, but you need to setup a DTRACE of the retrieval process and see where it is going wrong so I would recommend opening up a support case.