Hey guys,
Someone was logging in with spoofed usernames causing a security breach. I had to rollback the server to reverse the damage. Unfortunately this has been going on for some time under the radar so the rollback is rather large. The rollback is from July 7 6 PM CDT.
A login security plugin has been installed to deal with this vulnerability in tekkit. You will need to register a password upon your next login. You will need to use this password every login. If you forget your password you will need to contact me for a password reset. You can get more information about the plugin here.
Sorry for the inconvenience.