unable to update iphone 5s to ios 8.2 beta 2

hi
i couldnt update my iphone 5s(1533) to ios 8.2 beta 2.
because i recieve error (3194) from itunes when i want to update. i try it for several times. and any time recieve this error(3194).
my ios version is 8.1.3 .
pleaseeee help me.realy i need to jailbreak . thanks

sorry for my bad english ;)