system
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Same problem here, also with a Sony Blu-ray player (smart). Strangely enough, Real Player seems to be working fine on Roku 3 to stream movies from my PC (with Windows Networking In and Out set in AIS Firewall) but the Sony Blu-ray, which has, in the past, connected via Windows Media Player, cannot connect to the server unless I turn Avast IS firewall off. With firewall off, no problems from the Blu-ray player, but as soon as I turn it on, no connection to the server any longer. This, however, is with Windows 7 Ultimate SP1 not Win 8.1, so it isn’t a problem with Win 8.1 but with the firewall and Windows Media Player as a network service.