A server with the specified hostname could not be found Error In IOS

I Got below error in my Xcode 6.1.1 when i fetch data from .net webservice

"A server with the specified hostname could not be found"

I am using wi-fi network and simulator for same.

This webservice is work fine in Android but it only gives error in IOS

I dont know why this error is occur.This problem is from webservice server side or IOS side?

Please give advice