Trying to remember, I have seen this but it was a long time ago- 4.3 or 4.4 EES, I think. Is the port number for the integration engine the same in 4.5 as it is with 2013? Wish I could be more help! I have had to rename a file or folder under the Links folder for an add-on in the past, but I'm not sure if CRM puts anything there.