Around 1 hour ago i also had the same problem again, i have sent the LFS Developers an email the first time this happened to me, they said it could be the reason of the ddos attack that happened.
The server console says this:
Apr 14 00:36:37 Listen : Lost connection to master server
Apr 14 00:37:24 Auto reconnection to master
Apr 14 00:37:39 Handicaps :
Apr 14 00:41:00 Time out : Lost connection to master server
Apr 14 00:42:05 Auto reconnection to master
Apr 14 00:42:11 Handicaps :
Apr 14 00:45:03 Listen : Lost connection to master server
Apr 14 00:46:10 Auto reconnection to master