They’ve made a couple of announcements on Twitter:
Seems like only the EU-servers are down. Try to connect to any of the other locations:
ASIA: asia1-zcash.flypool.org
CHINA: cn1-zcash.flypool.org
USA: us1-zcash.flypool.org
I switched to the US server now, and it is working.
and enjoy temporary low diff network 
It seems that happy hour won’t last long, though:
Our EU stratum nodes are starting to come back online. We expect full service availability to be re-established soon.
— etherchain.org (@etherchain_org) November 9, 2017
It seems there is not much difference when these servers were down in terms of zec coins you got. The total hash rate drop, the blocks found were fewer as well, and therefore your share is almost the same.
EU servers are not online yet.
Ir wasn’t just Flypool EU servers, the rest were unreachable as well, this morning I couldn’t reach Ethermine.org at all either, and I tried mining on F2pool and Nanopool and none of them where connecting.
