It might be due to something on your end, and not the LFS masterserver or the servers that you are connecting to.
Has anything changed between when it worked normally and when you started getting errors? Did you change internet service providers, modem/router, install a new anti-virus/firewall or started using some sort of mod for LFS?
Is the "lost connection to host" the only error message that you get? Do you see any or error message on chat before you get the above error? Maybe something like
CPW or
OOS - CAR?
If possible, run tests from both
www.speedtest.net and
www.pingtest.net and post the results here. Might be able to see if this is mainly down to internet connectivity issues... When you get the pingtest results - have a look here:
http://www.pingtest.net/learn.php
i.e.
I'm not sure what's causing the error - but if you give more details and the post results from above two sites, maybe someone would be able to tell you how to sort it out. Good luck!
PS: If you do manage to sort it out, please post here stating what you did to sort it so someone in the future might be able to do the same if they get the same error.