vpnManager.loadFromPreferences { (error) in
        if error == nil {

            self.ipSecProtcol.serverAddress = "address"
            self.ipSecProtcol.authenticationMethod = NEVPNIKEAuthenticationMethod.certificate
            self.ipSecProtcol.identityData = NSData(contentsOfFile: Bundle.main.path(forResource: "client", ofType: "p12")!) as? Data
            self.ipSecProtcol.username = "username"
            self.ipSecProtcol.passwordReference = KeychainWrapper.getData("password")
            self.ipSecProtcol.identityDataPassword = "password"
            self.ipSecProtcol.useExtendedAuthentication = false
            self.ipSecProtcol.disconnectOnSleep = false

            self.vpnManager.protocolConfiguration = self.ipSecProtcol
            self.vpnManager.isOnDemandEnabled = false

            self.vpnManager.isEnabled = true

            self.vpnManager.saveToPreferences { (savingError) in

                if savingError == nil {
                    do {
                        try self.vpnManager.connection.startVPNTunnel()
                    }
                    catch {
                        print(error.localizedDescription)
                    }
                }else {
                    print(savingError?.localizedDescription)
                }
            }
        } else {
            print(error?.localizedDescription)
        }