IPSec VPN using NEVPNManager does not disconnect on sleep.

I'm working on an IPSec VPN solution for macOS. I've managed to get a VPN configuration installed via NEVPNManager and everything works. Except, my requirment is to disconnect the VPN when mac goes to sleep. Below is the IPSec profile which I am using.

- (void)setupIPSec

{

[self configVPNKeychain];

NSData *passwordData = [self persistentReferenceForSavedPassword:@"username" service:kPasswordReference account:@"account" description:@"login"];

NSData *sharedSecretData = [self persistentReferenceForSavedPassword:@"54343333" service:kSharedSecretReference account:@"account" description:@"IPSec Shared Secret"];

// config IPSec protocol

NEVPNProtocolIPSec *p = [[NEVPNProtocolIPSec alloc] init];

p.username = @"username012134";

p.serverAddress = @"ipsec.route.com";

// get password persistent reference from keychain

p.passwordReference = passwordData;

p.authenticationMethod = NEVPNIKEAuthenticationMethodSharedSecret;

p.sharedSecretReference = sharedSecretData;

p.useExtendedAuthentication = YES;

p.disconnectOnSleep = YES; // This is were I am setting YES to disconnect the VPN connection when on Sleep.

[NEVPNManager sharedManager].enabled = YES;

[NEVPNManager sharedManager].protocolConfiguration = p;

[NEVPNManager sharedManager].localizedDescription = @"VPN";

}

Can anyone please guide me.