有谁知道间歇性坏网关会发生在哪些场景？
我的客户端服务工作正常，突然间......糟糕的网关！
我目前的约束力：
<bindings>
<wsHttpBinding>
<binding name="ReceptorBinding" maxReceivedMessageSize="6291456" openTimeout="00:30:00"
closeTimeout="00:30:00" sendTimeout="00:30:00" receiveTimeout="00:30:00" useDefaultWebProxy="true" >
</binding>
</wsHttpBinding>
</bindings>
日志：
2013-12-09 09:42:49,659 [12] INFO - Sending package 1/616.
2013-12-09 09:47:07,025 [12] INFO - Sending package 2/616.
2013-12-09 09:50:43,510 [12] INFO - Sending package 3/616.
2013-12-09 09:55:33,195 [12] INFO - Sending package 4/616.
2013-12-09 09:58:41,370 [12] ERROR - [...]
错误：
System.ServiceModel.ProtocolException: The remote server returned an unexpected response: (502) Proxy Error. ---> System.Net.WebException: The remote server returned an error: (502) Bad Gateway.
at System.Net.HttpWebRequest.GetResponse()
at System.ServiceModel.Channels.HttpChannelFactory'1.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan timeout)
--- End of inner exception stack trace ---
Server stack trace:
at System.ServiceModel.Channels.HttpChannelUtilities.ValidateRequestReplyResponse(HttpWebRequest request, HttpWebResponse response, HttpChannelFactory'1 factory, WebException responseException, ChannelBinding channelBinding)
at System.ServiceModel.Channels.HttpChannelFactory'1.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan timeout)
at System.ServiceModel.Channels.RequestChannel.Request(Message message, TimeSpan timeout)
at System.ServiceModel.Channels.ClientReliableChannelBinder'1.RequestClientReliableChannelBinder`1.OnRequest(TRequestChannel channel, Message message, TimeSpan timeout, MaskingMode maskingMode)
at System.ServiceModel.Channels.ClientReliableChannelBinder'1.Request(Message message, TimeSpan timeout, MaskingMode maskingMode)
at System.ServiceModel.Channels.ClientReliableChannelBinder'1.Request(Message message, TimeSpan timeout)
at System.ServiceModel.Security.SecuritySessionClientSettings'1.SecurityRequestSessionChannel.Request(Message message, TimeSpan timeout)
at System.ServiceModel.Dispatcher.RequestChannelBinder.Request(Message message, TimeSpan timeout)
at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)
at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)
at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)
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 Infraero.TINE3.STTComum.Modelo.Contratos.IContratoServicoReceptor.EnviarBilhetes(ContratoDadosReceptor dados)
at Infraero.TINE3.STTColetor.Negocio.Proxies.ProxyReceptor.EnviarBilhetes(ContratoDadosReceptor dados) in D:\SVN\STT na SEDE\3-0_CodigoFonte_Coletor\3-4_SRC\Coletor 2.0\Infraero.TINE3.STTColetor.Negocio\Proxies\ProxyReceptor.cs:line 34
at Infraero.TINE3.STTColetor.Negocio.Servicos.ServicoTransmissao.TransmitirBilhetes(ProxyReceptor proxyEnterprise, Int32 quantidadeLotes, Int32 i) in D:\SVN\STT na SEDE\3-0_CodigoFonte_Coletor\3-4_SRC\Coletor 2.0\Infraero.TINE3.STTColetor.Negocio\Servicos\ServicoTransmissao.cs:line 122
at Infraero.TINE3.STTColetor.Negocio.Servicos.ServicoTransmissao.TransmitirBilhetes() in D:\SVN\STT na SEDE\3-0_CodigoFonte_Coletor\3-4_SRC\Coletor 2.0\Infraero.TINE3.STTColetor.Negocio\Servicos\ServicoTransmissao.cs:line 55