MacOS VPN Error NO Shared Secret was Provided Objective-C - ios

Question

I Face a big problem,I made a VPN for IOS Devices,it is on the appstore,it is working nicely,However i face problem with macos application,I use same codes.Same codes work for IOS Devices however they dont work for MacOS application.
The Problem says ;
No VPN shared secret was provided. Verify your settings and try reconnecting.
When i try to connect to vpn.
Code that i use for connect vpn
[[NEVPNManager sharedManager] loadFromPreferencesWithCompletionHandler: ^(NSError *error) {
NEVPNProtocolIPSec *p = [[NEVPNProtocolIPSec alloc] init];
p.serverAddress =ipAddress;
p.authenticationMethod = NEVPNIKEAuthenticationMethodSharedSecret;
NSLog(#"vpn connecting to ip %#",ipAddress);
p.username=#"vpnuser";
p.sharedSecretReference = [KeyChainHelper load:sharedSecret];
p.passwordReference = [KeyChainHelper load:password];
// NSData * data = [self searchKeychainCopyMatching:sharedSecret];
p.disconnectOnSleep = NO;
[NEVPNManager sharedManager].protocolConfiguration=p;
NSMutableArray *rules = [[NSMutableArray alloc] init];
NEOnDemandRuleConnect *connectRule = [NEOnDemandRuleConnect new];
[rules addObject:connectRule];
[[NEVPNManager sharedManager] setOnDemandRules:rules];
[[NEVPNManager sharedManager] setLocalizedDescription:#"VPN Fire"];
[[NEVPNManager sharedManager] setEnabled:YES];
[[NEVPNManager sharedManager] saveToPreferencesWithCompletionHandler: ^(NSError *error) {
NSLog(#"Save VPN to preference complete");
if (error) {
NSLog(#"Save error: %#", error);
}
NSError *startError;
[[NEVPNManager sharedManager].connection startVPNTunnelAndReturnError:&startError];
delayStart(5)
NSLog(#"%#",[NEVPNManager sharedManager]);
NSLog(#"%#",[NEVPNManager sharedManager]);
delayEnd
if(startError) {
NSLog(#"Start error: %#", startError.localizedDescription);
}
}];
}];
Here i put some screenshoots;

Answer 1

Looks like KeyChainHelper is a wrapper for accessing the keychain. It isn't clear exactly what the KeyChainHelper::load() method returns, but my guess is either a standard reference or data.
NEVPNProtocolIPSec::sharedSecretReference is defined as:
A persistent keychain reference to a keychain item containing the IKE shared secret.
You need to create a keychain item of type kSecClassGenericPassword to use as the shared secret, and provide a persistent reference to the keychain item. A persistent reference is critical here, as it can be stored to disk or passed between processes, which is required for NEVPNManager to access the shared secret and connect your VPN. Likewise for passwordReference.
You will need to use SecItemCopyMatching with return type kSecReturnPersistentRef to achieve this. Your KeyChainHelper class may provide a method to return the persistent reference.