The FTB Infinity Expert Mode Server is Up. There is currently no registration for it. I will post updates on this website, and maybe open for registrations.
Unfortunately, the current server that is up is experiencing severe lag spikes, which are making the game unplayable. I am hoping to resolve this issue as fast as possible. I can not run the server to the public while performing tests to pinpoint the source of lag. Theses test might take time to run so that the server might be down for awhile.