Following the server maintenance on February 1, 2016, the [https://nasc.nintendowifi.net/ac nasc] URL now returns an error indicating a sysupdate is required when a pre-v10.5 3DS tries to send a request with that URL. The server now checks that the fpdver value sent in the request is the newer one described in the above friends-module section. Hence, this blocks everything requiring friends-login including online-multiplayer where the 3DS has friends-module <v10.5 installed.
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Following the server maintenance on February 1, 2016, the [https://nasc.nintendowifi.net/ac nasc] URL now returns an error indicating a sysupdate is required when a pre-v10.5 3DS tries to send a request with that URL. The server now checks that the fpdver value sent in the request is the newer one described in the above friends-module section.
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Hence, this blocks "everything" requiring friends-login including online-multiplayer where the 3DS has friends-module <v10.5 installed. This somehow doesn't affect the YouTube application even though it does a friends-login.