NSURLError: the network connection was lost

Can someone help me understanding and resolving this error I am getting when connecting to web service:

NSURLError is: Domain=NSURLErrorDomain Code=-1005 "The network connection was lost." NSErrorFailingURLStr开发者_运维知识库ingKey=http://username:password@..org:443/zws/xmlrpc/restricted1/, NSErrorFailingURLKey=http://username:password@..org:443/zws/xmlrpc/restricted1/, NSLocalizedDescription=The network connection was lost., NSUnderlyingError=0x5f2b300 "The network connection was lost.