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[lbendlin]

Are you checking the connection before you attempt your data transfer?

something like

BOOL isDataSourceAvailable()
{
	SCNetworkReachabilityRef reachabilityRef = SCNetworkReachabilityCreateWithName(kCFAllocatorDefault, "www.yourserver.com");
	SCNetworkReachabilityFlags reachabilityFlags;
	BOOL gotFlags = SCNetworkReachabilityGetFlags(reachabilityRef, &reachabilityFlags);
	CFRelease(reachabilityRef);
    if (!gotFlags) return NO;
	BOOL isReachable = reachabilityFlags & kSCNetworkReachabilityFlagsReachable;
	BOOL noConnectionRequired = !(reachabilityFlags & kSCNetworkReachabilityFlagsConnectionRequired);
	if ((reachabilityFlags & kSCNetworkReachabilityFlagsIsWWAN)) noConnectionRequired = YES;
	return (isReachable && noConnectionRequired) ? YES : NO;
}