Microsoft Skype for Business Server 2015
Published Jul 06, 2015
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Hello LH, If you take a look at the following link that shows the HLB ports for front end services it has 8080 on there for client/device retrieval of root certs. https://technet.microsoft.com/en-us/library/gg398833.aspx
So that is why the port exists, however the sharing issue you ran into is also fixed, please download the template and retry with shared IP's.
Thanks,