I just got on your default Minecraft server. It's to be on again, after multiple attempts of trying to get anywhere. I don't really care for modding the game, so I wonder if that's what I needed to get into your server before the update?
My name's JayBiondo.
No, anyone can access the Spout/Vanilla server. The Tekkit server requires the Technic Launcher which can be found here: http://www.technicpack.net/tekkit/
Soutcraft can be found here: http://dev.bukkit.org/client-mods/spoutcraft/ though it isn't required, it IS recommended. The Spout server right now isn't using Spoutcraft atm due to updates, so just connect through the vanilla launcher for now.