Recently there have been folks going into the nether by in game means and not 3rd party utilitys.
Although this seemed fine at first; after some digging we found that by doing this it compromises server stability and can cause an unrecoverable crash. On that note the nether is no longer accessible on the server and is not meant to be on terrafirmacraft. You can keep your items from there but can no longer go to the Nether.