no, i'm not in china. (what's the UAE thing?) i'm european. greece to be exact. as far as i know my provider uses only a very basic firewall, blocking unsolited incoming connections, to ports 20-21, and 445. (i have firewall installed only to my ubuntu desktop. the 3 tinys i have, don't have firewalls)..
my provider is OTE.SA greece (the biggest provider in greece). i don't think that they have sent spam crap anywhere (and blocked), but how can i check this, just to be sure? it's unlikely though, because i can connect from time to time. if i (or the provider) was blocked, i wouldn't be able to connect at all...
as far as i have tested, for me, the ftp.vim.org works better than all the others (still having serious disconnection problems though).