Hi, i think i solved the problem.
i must be put the "Use custom DNS servers"
now working......
but IPv4 broadcast must be fill or not? i'm not fill..... i don't know what write.....
Leave it alone if its working. broadcast address can be deduced automatically most of the time (its the top ip within a segment).
Try using multiple pools in case one fails. Most pools have multiple url addresses for different locations.