System.Net.Sockets.SocketException (0x80004005): No connection could be made because the target machine actively refused it 10.124.64.178:7981

Server stack trace: 
   at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress socketAddress)
   at System.Net.Sockets.Socket.Connect(EndPoint remoteEP)
   at System.Runtime.Remoting.Channels.RemoteConnection.CreateNewSocket(EndPoint ipEndPoint)
   at System.Runtime.Remoting.Channels.SocketCache.GetSocket(String machinePortAndSid, Boolean openNew)
   at System.Runtime.Remoting.Channels.Tcp.TcpClientTransportSink.SendRequestWithRetry(IMessage msg, ITransportHeaders requestHeaders, Stream requestStream)
   at System.Runtime.Remoting.Channels.Tcp.TcpClientTransportSink.ProcessMessage(IMessage msg, ITransportHeaders requestHeaders, Stream requestStream, ITransportHeaders& responseHeaders, Stream& responseStream)
   at System.Runtime.Remoting.Channels.BinaryClientFormatterSink.SyncProcessMessage(IMessage msg)

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 Pdftools.Converter.IConverterService.CreateJob()
   at CMI.Renderer.PdfToolsDocumentRenderer.PdfToolsDocumentRenderer.Render(Guid rendererGuid, RenderingParameter[] renderingParameters, Byte[] inputBytes, String inputExtension, Byte[]& outputBytes, String& outputExtension, Nullable`1 hyphenationIsDisabled) in D:\BuildAgents\A2\work\dc1e4e74aab28009\src\CMI.Renderer.PdfToolsDocumentRenderer\PdfToolsDocumentRenderer.cs:line 48