CrmServiceClient connection to Dynamics CRM IFD fails randomly

Hello,

Hopefully someone can shed some light into an issue I am having trouble getting resolved.

We have a web application that has to connect to a Dynamics CRM IFD, and it works some times... but fails to connect most of the times. When used on other CRMs, everything works perfect... we just have problems with IFD.

I have read a lot of posts about using CrmServiceClient and I believe the error could be related to the fact that we are not holding on to an instance of CrmServiceClient. We create new ones "every once in a while".

The constructor we are using is Version 9 of the SDK:

CrmServiceClient(credential, authType, hostname, port, orgName, useUniqueInstance, useSsl);

And the trace log with the error shows this on creation:

Microsoft.Xrm.Tooling.Connector.CrmServiceClient Error: 2 : ERROR REQUESTING ORGS FROM THE DISCOVERY SERVER
Microsoft.Xrm.Tooling.Connector.CrmServiceClient Error: 2 : Source	: mscorlib
Method	: HandleReturnMessage
Date	: 3/23/2018
Time	: 3:56:06 PM
Error	: An unsecured or incorrectly secured fault was received from the other party. See the inner FaultException for the fault code and detail.
Stack Trace	: Server stack trace: 
   at System.ServiceModel.Channels.SecurityChannelFactory`1.SecurityRequestChannel.ProcessReply(Message reply, SecurityProtocolCorrelationState correlationState, TimeSpan timeout)
   at System.ServiceModel.Channels.SecurityChannelFactory`1.SecurityRequestChannel.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 Microsoft.Xrm.Sdk.Discovery.IDiscoveryService.Execute(DiscoveryRequest request)
   at Microsoft.Xrm.Sdk.Client.DiscoveryServiceProxy.Execute(DiscoveryRequest request)
   at Microsoft.Xrm.Tooling.Connector.CrmWebSvc.DiscoverOrganizations(Uri discoveryServiceUri, Uri homeRealmUri, ClientCredentials clientCredentials, ClientCredentials deviceCredentials, CrmLogEntry logSink)
======================================================================================================================
Inner Exception Level 1	: 
Source	: Not Provided
Method	: Not Provided
Date	: 3/23/2018
Time	: 3:56:06 PM
Error	: ID3242: The security token could not be authenticated or authorized.
Stack Trace	: Not Provided
======================================================================================================================

Microsoft.Xrm.Tooling.Connector.CrmServiceClient Error: 2 : Source	: mscorlib
Method	: HandleReturnMessage
Date	: 3/23/2018
Time	: 3:56:06 PM
Error	: An unsecured or incorrectly secured fault was received from the other party. See the inner FaultException for the fault code and detail.
Stack Trace	: Server stack trace: 
   at System.ServiceModel.Channels.SecurityChannelFactory`1.SecurityRequestChannel.ProcessReply(Message reply, SecurityProtocolCorrelationState correlationState, TimeSpan timeout)
   at System.ServiceModel.Channels.SecurityChannelFactory`1.SecurityRequestChannel.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 Microsoft.Xrm.Sdk.Discovery.IDiscoveryService.Execute(DiscoveryRequest request)
   at Microsoft.Xrm.Sdk.Client.DiscoveryServiceProxy.Execute(DiscoveryRequest request)
   at Microsoft.Xrm.Tooling.Connector.CrmWebSvc.DiscoverOrganizations(Uri discoveryServiceUri, Uri homeRealmUri, ClientCredentials clientCredentials, ClientCredentials deviceCredentials, CrmLogEntry logSink)
   at Microsoft.Xrm.Tooling.Connector.CrmWebSvc.InitCRM2011Service()
======================================================================================================================
Inner Exception Level 1	: 
Source	: Not Provided
Method	: Not Provided
Date	: 3/23/2018
Time	: 3:56:06 PM
Error	: ID3242: The security token could not be authenticated or authorized.
Stack Trace	: Not Provided
======================================================================================================================

Microsoft.Xrm.Tooling.Connector.CrmServiceClient Error: 2 : Unable to Login to Dynamics CRM

Any thoughts will be very appreciated!

thanks

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