Multiplayer

every time i try to play multiplayer it says " ATTENTION Unable to connect to the Halo 5: Guardians Lobby Service"
I ALREADY DID THE CAMPAIGN ON LEGENDARY SOLO, ID LIKE TO RANK UP IN MULTIPLAYER SOMETIME TODAY !
and yet bungie doesn’t even seem to answer back to anyone also having this issue. My game was fine yesterday

Does your internet service have built in parental controls?

I have just seen a post on xbox.com from somebody having the same problem being caused Sky broadband blocking Halo 5 due to the network level parental controls