SM2012 - Portal gives 404 error when opening KB article

Question

In my System Center 2012 Service Manager demo environment, the portal bombs out the 404 error below whenever a user tries to open a Knowledge Base article.  This happens with normal end users and administrators, and when done from the Help Articles
search page or from a Service Offering page.  So far, everything else is working fine in the portal.
Does anyone have any ideas for troubleshooting this?
Server Error in '/ContentHost' Application.
The remote server returned an error: (404) Not Found.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information
about the error and where it originated in the code. 
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
[WebException: The remote server returned an error: (404) Not Found.]
System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult) +3236137
System.ServiceModel.Channels.HttpChannelAsyncRequest.CompleteGetResponse(IAsyncResult result) +216
[EndpointNotFoundException: There was no endpoint listening at https://MyFQDN.local/ServiceHost/Services/DataAccessService.svc that could accept the message. This is often caused by an incorrect address or SOAP action. See InnerException, if present, for more details.]
System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg) +4728723
System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type) +1725
Microsoft.EnterpriseManagement.Presentation.DataAccess.Proxy.ServiceReference.IDataAccessService.EndExecute(IAsyncResult result) +0
Microsoft.EnterpriseManagement.Presentation.DataAccess.Proxy.ServiceReference.DataAccessServiceClient.EndExecute(IAsyncResult result) +323
Microsoft.EnterpriseManagement.Presentation.DataAccess.ProxyDataGateway.ExecuteScalar(DataCommandScalar`1 command) +654
[DataAccessException: There was no endpoint listening at https://MyFQDN.local/ServiceHost/Services/DataAccessService.svc that could accept the message. This is often caused by an incorrect address or SOAP action. See InnerException, if present, for more details.]
Microsoft.EnterpriseManagement.ServiceManager.Portal.ContentHost.KnowledgeArticleHandler.GetEndUserContent(HttpContext context) +1291
Microsoft.EnterpriseManagement.ServiceManager.Portal.ContentHost.KnowledgeArticleHandler.ProcessRequest(HttpContext context) +287
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +625
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +270
Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.272
Nash Pherson, Senior Systems Consultant, Now Micro - http://www.nowmicro.com <--- If this post was helpful, please click "Vote as Helpful".

Answer 1

 
I have the the same problem, when opening an KB article on the web Portal of SCSM2012R2:
[WebException: The remote server returned an error: (404) Not Found.]    System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult) +8606675    System.ServiceModel.Channels.HttpChannelAsyncRequest.CompleteGetResponse(IAsyncResult
result) +222
[EndpointNotFoundException: There was no endpoint listening at http://myserver.xyz.corp:81/ServiceHost/Services/DataAccessService.svc that could accept the message. This is often caused by an incorrect address or SOAP action. See InnerException, if present,
for more details.]    System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg) [phone]    System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type) +622  
 Microsoft.EnterpriseManagement.Presentation.DataAccess.Proxy.ServiceReference.IDataAccessService.EndExecute(IAsyncResult result) +0    Microsoft.EnterpriseManagement.Presentation.DataAccess.Proxy.ServiceReference.DataAccessServiceClient.EndExecute(IAsyncResult
result) +323    Microsoft.EnterpriseManagement.Presentation.DataAccess.ProxyDataGateway.ExecuteScalar(DataCommandScalar`1 command) +654
[DataAccessException: There was no endpoint listening at http://myserver.xyz.corp:81/ServiceHost/Services/DataAccessService.svc that could accept the message. This is often caused by an incorrect address or SOAP action. See InnerException, if present, for more
details.]    Microsoft.EnterpriseManagement.ServiceManager.Portal.ContentHost.KnowledgeArticleHandler.GetEndUserContent(HttpContext context) +1292    Microsoft.EnterpriseManagement.ServiceManager.Portal.ContentHost.KnowledgeArticleHandler.ProcessRequest(HttpContext
context) +287    System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +913    System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +165
But
http://myserver.xyz.corp:81/ServiceHost/Services/DataAccessService.svc
is responding fine. So the endpoint is listening, also the webservice is reachable
this is the actual url which is failing:
https://myserver.xyz.corp/ContentHost/ClientBin/KnowledgeArticleViewer.aspx?ArticleId=4517f8fb-520b-e2ff-635c-8196583a9a05
a call to
https://myserver.xyz.corp/ContentHost/ClientBin/KnowledgeArticleViewer.aspx?ArticleId=
responses with “unrecognized guid format”. so the webservice KnowledgeArticleViewer seems to be reachable. the GUID also is fine (checked with a runbook and this is the proper scobjectid)
seems to be independend of permissions, even members of the administators role have the same issue
any ideas?
regards
Manfred