You have to be using at 1.7.10 or 1.8 to login to our network, 1.7.9 will not work. Also, by using 1.7.10, you won't be able to join Skyblock, Factions, Creative, or Prison because they're fully 1.8.
@bub_green when u first go to the first screen where u have the "multiplayer option, it gives the option to change to 1.7.6 or something like that. I had the same problem when i first got resil