This first appeared two or three weeks ago, following the installation of a new fibre router (so I assumed that was the issue). Bell was absolutely not helpful, claimed not responsible for Apple products. Symptoms are.... No Home Sharing to iPad or 3rd generation AppleTVs (One wifi, one ethernet) but ... and here's the twist... my Mac can see the iPads when they are web browsing and the AppleTV's recognize the name of the iTunes shared library when I changed the name. iTunes works fine streaming content from the iTunes store . I changed the name of my desktop system, as suggested and this similarly had no effect.
Has anyone had similar experiences and, if so, what was the solution?
Mac mini (Late 2014), OS X Yosemite (10.10.5), iTunes 12.3.2