cocos2dx安卓更新提 unable to resolve host no address associated with hostname

Cocos2d-x
#1

java.net.unknownhostexception unable to resolve host no address associated with hostname android
出这个错怎么原因？
再指定一个IP更新正常下载，换一个ftp ip就不正常，再win32和ios下又都是正常