The requested service (IPushNotificationService) may not be running. [LFF3004-UnableToOpenServiceProxy]

Details:
URL: /Forms/webapi/v1/notification/GetPushNotificationToken?forceNew=false&skipErrMsg=true
Error: UnableToOpenServiceProxy
Date: 5/24/2019 9:56:51 AM (South Africa Standard Time)
HTTP Status Code: 500
Business Process ID: 0
User: Giulietta Holland
IP: 10.77.77.14
Browser: Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36

Stack Trace:
Caught exception: Laserfiche.Forms.CommonUtils.Exceptions.LFFormsException
Message: The requested service (IPushNotificationService) may not be running. [LFF3004-UnableToOpenServiceProxy]
   at FormsModel.SharedContracts.PushNotificationServiceProxy.GetProxy()
   at FormsModel.SharedContracts.PushNotificationServiceProxy.Register(PushServiceRegisterRequest request)

Inner exception: System.ServiceModel.EndpointNotFoundException
Message: No DNS entries exist for host lf.inset.co.za.

Server stack trace: 
   at System.ServiceModel.Channels.DnsCache.Resolve(Uri uri)
   at System.ServiceModel.Channels.SocketConnectionInitiator.GetIPAddresses(Uri uri)
   at System.ServiceModel.Channels.SocketConnectionInitiator.Connect(Uri uri, TimeSpan timeout)
   at System.ServiceModel.Channels.BufferedConnectionInitiator.Connect(Uri uri, TimeSpan timeout)
   at System.ServiceModel.Channels.ConnectionPoolHelper.EstablishConnection(TimeSpan timeout)
   at System.ServiceModel.Channels.ClientFramingDuplexSessionChannel.OnOpen(TimeSpan timeout)
   at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)
   at System.ServiceModel.Channels.ServiceChannel.OnOpen(TimeSpan timeout)
   at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)

Exception rethrown at [0]: 
   at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
   at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
   at System.ServiceModel.ICommunicationObject.Open()
   at FormsModel.SharedContracts.ServiceProxyBase`1.GetProxy(Int32 hours, Int32 minutes, Int32 seconds)

Inner exception: System.Net.Sockets.SocketException
Message: No such host is known
   at System.Net.Dns.GetAddrInfo(String name)
   at System.Net.Dns.InternalGetHostByName(String hostName, Boolean includeIPv6)
   at System.Net.Dns.GetHostEntry(String hostNameOrAddress)
   at System.ServiceModel.Channels.DnsCache.Resolve(Uri uri)