The communication object System ServiceModel Channels ServiceChannel cannot be used for communication

Question

The communication object  System ServiceModel Channels ServiceChannel     cannot be used for communication because it is in the Faulted state     What is this error all about  and how would I go about solving it

User · Answer

I know this is an older post but one thing to watch out for when you cannot change the security is to make sure that your username and password are set.

I had a service with authenticationMode as UserNameOverTransport, when the username and password were not set for the service client I would get this error.

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For me it was a load balancer url issue  A web service behind a load balancer called another service behind the same load balancer using the full url like  loadbalancer mycompany com  I changed it to bypass the load balancer when calling the second service by using localhost mycompany com instead    I think there was some kind of circular reference issue going on with the load balancer

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I had another problem  that I don t think have been mentioned in the other answers   I have to service endpoints on the same tcp address and port  In the app config  I had forgotten to add both endpoints  so the service was running on the correct port  but with the wrong service interface

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This error can be triggered by your own computer too  and not just an unhandled exception  If your server computer has its clock time off by too many minutes  many  NET web services will reject your request with an unhandled error  It s handled from their point of view  but unhandled from your point  Check to make sure your receiving server s clock time is correct  If it needs to be fixed  you ll have to reset your service or reboot before the channel reopens   I experienced this issue on a server where the firewall blocked the Internet time update  and the server got off time for some reason  All the 3rd party  NET web services went into fault because they rejected any web service request  Digging into the Event Viewer helped identify the problem  but adjusting the clock solved it  The error was on our end even though we received the Faulted State error message for future web service calls

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You get this error because you let a  NET exception happen on your server side  and you didn t catch and handle it  and didn t convert it to a SOAP fault  either   Now since the server side  bombed  out  the WCF runtime has  faulted  the channel - e g  the communication link between the client and the server is unusable - after all  it looks like your server just blew up  so you cannot communicate with it any more   So what you need to do is    always catch and handle your server-side errors - do not let  NET exceptions travel from the server to the client - always wrap those into interoperable SOAP faults  Check out the WCF IErrorHandler interface and implement it on the server side if you re about to send a second message onto your channel from the client  make sure the channel is not in the faulted state   if client InnerChannel State    System ServiceModel CommunicationState Faulted          call service - everything s fine   else         channel faulted - re-create your client and then try again     If it is  all you can do is dispose of it and re-create the client side proxy again and then try again

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Not a solution to this issue  but if you re experiencing the above error with Ektron eSync  it could be that your database has run out of disk space   Edit  In fact this isn t entirely an Ektron eSync only issue  This could happen on any service that querying a full database   Edit  Out of disk space  or blocking access to a directory that you need will cause this issue

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I had the same problem while trying to consume net tcp wcf service endpoint in a http asmx service    As I saw no one wrote specific answer WHY is this problem occurring  but only how to be handled properly   I ve been struggling with it several days in a row and finally I found out where the problem comes from in my case   Initially I thought that when you make a reference to a service the config file will be configured regarding security tag the same way as it s in the source  but that was not the case and I should take care of it manually  In my case I had only   lt netTcpBinding gt       lt binding name  NetTcpBinding IAuthenticationLoggerService       lt  binding gt   lt  netTcpBinding gt     Later I saw that the security part is missing and it should looks like this   lt netTcpBinding gt       lt binding name  NetTcpBinding IAuthenticationLoggerService  transferMode  Buffered  gt         lt security mode  None  gt           lt transport clientCredentialType  None   gt         lt  security gt       lt  binding gt     lt  netTcpBinding gt    The second problem in my case was that I was using transferMode  Streamed  on my source WCF service and in the client I had nothing specific about it  which was bad  because the default transferMode is Buffered and it s important on both places source and client to be configured in the same way

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To prevent the Server from fall in Fault state  you have to ensure that no unhandled exception is raised  If WCF sees an unexpected Exception  no more calls are accepted - safety first  Two possibilties to avoid this behaviour      Use a FaultException  this one is not unexpected for WCF  so the WCF knows that the server has still a valid state  instead of    throw new Exception  Error xy in my function       use always    throw new FaultException  Error xy in my function       perhaps you can try  catch the whole block and throw a FaultException in all cases of an Exception  try                some code here      catch  Exception ex          throw new FaultException ex Message        Tell WCF to handle all Exceptions using an Errorhandler  This can be done in several ways  I chose a simple one using an Attribute  All we have to do more  is to use the attribute  SvcErrorHandlerBehaviour  on the wanted Service Implementation  using System  using System Collections ObjectModel  using System ServiceModel  using System ServiceModel Channels  using System ServiceModel Description  using System ServiceModel Dispatcher   namespace MainService Services            lt summary gt          Provides FaultExceptions for all Methods Calls of a Service that fails with an Exception          lt  summary gt      public class SvcErrorHandlerBehaviourAttribute   Attribute  IServiceBehavior               public void Validate ServiceDescription serviceDescription  ServiceHostBase serviceHostBase                implementation not needed          public void AddBindingParameters ServiceDescription serviceDescription  ServiceHostBase serviceHostBase  Collection lt ServiceEndpoint gt  endpoints                                           BindingParameterCollection bindingParameters                implementation not needed          public void ApplyDispatchBehavior ServiceDescription serviceDescription  ServiceHostBase serviceHostBase                        foreach  ChannelDispatcherBase chanDispBase in serviceHostBase ChannelDispatchers                                ChannelDispatcher channelDispatcher   chanDispBase as ChannelDispatcher                  if  channelDispatcher    null                      continue                  channelDispatcher ErrorHandlers Add new SvcErrorHandler                                        public class SvcErrorHandler  IErrorHandler               public bool HandleError Exception error                          You can log th message if you want              return true                     public void ProvideFault Exception error  MessageVersion version  ref Message msg                        if  error is FaultException                  return               FaultException faultException   new FaultException error Message               MessageFault messageFault   faultException CreateMessageFault                msg   Message CreateMessage version  messageFault  faultException Action                        This is an easy example  you can dive deeper into IErrorhandler by not using the naked FaultException  but a FaultException lt  gt  with a type that provides additional info see IErrorHandler for an detailed example

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The server will automatically abort connections over which no message has been received for the duration equal to the receive timeout  default is 10 mins   This is a DoS mitigation to prevent clients from forcing the server to have connections open for an indefinite amount of time   Since the server aborts the connection because it has gone idle  the client gets this exception    You can control how long the server allows a connection to go idle before aborting it by configuring the receive timeout on the server s binding  Credit  T R Vishwanath - MSFT

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In my case the reason was some wrong certificate that could not be loaded  I found out about it from the Event Viewer  under System      A fatal error occurred when attempting to access the TLS server   credential private key  The error code returned from the cryptographic   module is 0x8009030D  The internal error state is 10001

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If you see this message in Debug from Visual Studio and solution contains WCF project  Then open this WCF project settings -  go to  WCF Options  tab -  off  Start WCF Service Host when debugging     option

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For me the issue was caused by config file automatically genearted by importing the WSDL  I updated the binding to from basicHttpBinding to customBinding  Adding additional exception handling did not help pointing this out   Before   lt basicHttpBinding gt               lt binding name  ServiceName  gt                   lt security mode  Transport    gt               lt  binding gt           lt  basicHttpBinding gt     After   lt customBinding gt           lt binding name  ServiceName  gt             lt textMessageEncoding messageVersion  Soap12    gt             lt httpsTransport   gt           lt  binding gt         lt  customBinding gt

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we are using MSMQ in our system  this error message came  The reason was our queue was full and we did not handle the error logging mechanism properly so we were getting the above exception instead of msmq ful  We cleared the messages then it is working fine

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As a matter of fact  if unsuccessful after following suggestions by marc s  please keep in mind that a  lt security gt  element in server binding configuration  or lack thereof  in web config on the server may cause this exception  For instance the server is expecting Message-level security and client is configured to None  or  if the server is not part of an Active Directory domain but the remote client host is       Tip  In such cases the client app will most likely invoke the web service fine when executed directly on the server machine under administrative account in RDP session

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To diagnose this problem  run the service under the Visual Studio debugger   Use the menu  Debug Exceptions and indicate that you want to break when an Exception is thrown     The original exception thrown will have a much better error message than    it is in the Faulted state     For example I was getting this exception from ServiceHost Open    but when I caught the original exception at the time it was thrown  the error message was      Service  MyServiceName  has zero application  non-infrastructure    endpoints     This might be because no configuration file was found   for your application  or because no service element matching the   service name could be found in the configuration file  or because no   endpoints were defined in the service element    Fixing the spelling error in App config solved the problem

[c#] The communication object, System.ServiceModel.Channels.ServiceChannel, cannot be used for communication

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