The pool is still down for me, same message as above. Seems like pool owner must use some kind of anti-ddos service such as cloudflare to handle the ddos issue.
cloudflare protect only http traffic, and cannot protect stratum. so CF is useless in this situation. 
Anyway, this attach is udp flood, and handled by hosting provider.
If you have connection issue, maybe your ip address (or range) is filtered by them. Try wait a little, or change ip.
Elbandi
If I'm not mistaken, there are higher package in cloudflare that protect other tcp and udp port, but of course it will be expensive.
Let me change IP and test again later.
IP changed, and it works for a few submission with accepted status, and then it failed again... Another machine with static IP still can't connect to pool yet.
Very unstable. 