PlayStation 4 players of Destiny are currently experiencing BUFFALO errors that prevent them from being able to log into the game.
The developers are aware of the issue and is working to resolve it, @BungieHelp has stated on Twitter.
We are aware of players on PlayStation 4 who are encountering BUFFALO errors and we are currently investigating. Standby for updates.
— Bungie Help (@BungieHelp) September 28, 2015
As the issue is limited to PS4 players, those on the PlayStation 3, Xbox 360 and Xbox One shouldn't be having any problems logging into the game at this time.
Buffalo buffalo buffalo.