When I try and and delete anything in my mailbox using OWA I get an "An Unexpected Error occured and your requeste couldn't be handled". Upon looking in the event log I find the following: Log Name: Application Source: System.ServiceModel 3.0.0.0 Date: 21/09/2010 18:10:00 Event ID: 3 Task Category: WebHost Level: Error Keywords: Classic User: SYSTEM Computer: exchange2010.nameremoved.co.uk Description: WebHost failed to process a request. Sender Information: System.ServiceModel.ServiceHostingEnvironment+HostingManager/30542218 Exception: System.ServiceModel.ServiceActivationException: The service '/EWS/Exchange.asmx' cannot be activated due to an exception during compilation. The exception message is: A binding instance has already been associated to listen URI 'http://exchange2010.nameremove.co.uk/EWS/Exchange.asmx'. If two endpoints want to share the same ListenUri, they must also share the same binding object instance. The two conflicting endpoints were either specified in AddServiceEndpoint() calls, in a config file, or a combination of AddServiceEndpoint() and config. . ---> System.InvalidOperationException: A binding instance has already been associated to listen URI 'http://exchange2010.nameremove.co.uk/EWS/Exchange.asmx'. If two endpoints want to share the same ListenUri, they must also share the same binding object instance. The two conflicting endpoints were either specified in AddServiceEndpoint() calls, in a config file, or a combination of AddServiceEndpoint() and config. at System.ServiceModel.Description.DispatcherBuilder.InitializeServiceHost(ServiceDescription description, ServiceHostBase serviceHost) at System.ServiceModel.ServiceHostBase.InitializeRuntime() at System.ServiceModel.ServiceHostBase.OnOpen(TimeSpan timeout) at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout) at System.ServiceModel.ServiceHostingEnvironment.HostingManager.ActivateService(String normalizedVirtualPath) at System.ServiceModel.ServiceHostingEnvironment.HostingManager.EnsureServiceAvailable(String normalizedVirtualPath) --- End of inner exception stack trace --- at System.ServiceModel.ServiceHostingEnvironment.HostingManager.EnsureServiceAvailable(String normalizedVirtualPath) at System.ServiceModel.ServiceHostingEnvironment.EnsureServiceAvailableFast(String relativeVirtualPath) Process Name: w3wp Process ID: 2012 Event Xml: <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"> <System> <Provider Name="System.ServiceModel 3.0.0.0" /> <EventID Qualifiers="49154">3</EventID> <Level>2</Level> <Task>5</Task> <Keywords>0x80000000000000</Keywords> <TimeCreated SystemTime="2010-09-21T17:10:00.000000000Z" /> <EventRecordID>34125</EventRecordID> <Channel>Application</Channel> <Computer>exchange2010.dartford.gov.uk</Computer> <Security UserID="S-1-5-18" /> </System> <EventData> <Data>System.ServiceModel.ServiceHostingEnvironment+HostingManager/30542218</Data> <Data>System.ServiceModel.ServiceActivationException: The service '/EWS/Exchange.asmx' cannot be activated due to an exception during compilation. The exception message is: A binding instance has already been associated to listen URI 'http://exchange2010.nameremove.co.uk/EWS/Exchange.asmx'. If two endpoints want to share the same ListenUri, they must also share the same binding object instance. The two conflicting endpoints were either specified in AddServiceEndpoint() calls, in a config file, or a combination of AddServiceEndpoint() and config. . ---&gt; System.InvalidOperationException: A binding instance has already been associated to listen URI 'http://exchange2010.nameremove.co.uk/EWS/Exchange.asmx'. If two endpoints want to share the same ListenUri, they must also share the same binding object instance. The two conflicting endpoints were either specified in AddServiceEndpoint() calls, in a config file, or a combination of AddServiceEndpoint() and config. at System.ServiceModel.Description.DispatcherBuilder.InitializeServiceHost(ServiceDescription description, ServiceHostBase serviceHost) at System.ServiceModel.ServiceHostBase.InitializeRuntime() at System.ServiceModel.ServiceHostBase.OnOpen(TimeSpan timeout) at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout) at System.ServiceModel.ServiceHostingEnvironment.HostingManager.ActivateService(String normalizedVirtualPath) at System.ServiceModel.ServiceHostingEnvironment.HostingManager.EnsureServiceAvailable(String normalizedVirtualPath) --- End of inner exception stack trace --- at System.ServiceModel.ServiceHostingEnvironment.HostingManager.EnsureServiceAvailable(String normalizedVirtualPath) at System.ServiceModel.ServiceHostingEnvironment.EnsureServiceAvailableFast(String relativeVirtualPath)</Data> <Data>w3wp</Data> <Data>2012</Data> </EventData> </Event> I also get this event log error: Log Name: Application Source: MSExchange OWA Date: 21/09/2010 18:22:05 Event ID: 108 Task Category: Configuration Level: Error Keywords: Classic User: N/A Computer: exchange2010.nameremoved.co.uk Description: Outlook Web App couldn't connect Exchange Web Services due to a configuration error. Response code = "500". Event Xml: <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"> <System> <Provider Name="MSExchange OWA" /> <EventID Qualifiers="49152">108</EventID> <Level>2</Level> <Task>3</Task> <Keywords>0x80000000000000</Keywords> <TimeCreated SystemTime="2010-09-21T17:22:05.000000000Z" /> <EventRecordID>34130</EventRecordID> <Channel>Application</Channel> <Computer>exchange2010.nameremoved.co.uk</Computer> <Security /> </System> <EventData> <Data>500</Data> </EventData> </Event>

Any ideas?

Apologies, I will post in the Exchange 2010 forums as well. Yes this is Exchange 2010 with SP1. As far as I can tell it did happen since applying SP1. All users have the problem. I have checked the bindings are there are no host names specified. The ExBPA comes back with nothing unusual.

I'm facing the same problem since SP1

I had same issue, but all the user. the new user is ok. but old user have issue. No one have fix yet?

This worked for me also. Make sure you run an IISRESET in order for the changes to take affect. You can do that or just restart the World Wide Web service.

Ok, this only worked temporarly. As long as I remove the host address from my IIS bindings, this works. The problem with removing the host address is my Exchange Admin Console won't load until I put the bindings back in. There are so many posts on the internet about this problem and yet I don't see anyone (Microsoft) offering a solution.

Hi, can you give me more Infos? How you fixed this??? Many Greetings, Manuel

I guess too many issue would cause this problem . like web.config and permission .... But only your one worked for me , so thank you very much I actualy added 2 https header I guess it wasnt good ;)

removing bindings with host name has fixed the issue for me. thanks a lot

Having same issue and all the quoted solution just not working for me, mine has to do with all users not been able to click reply. They get this error below, nut it is asking for valid domain name. An unexpected error occurred and your request couldn't be handled. Request Url: https://intranet.jaizbankplc.com:443/owa/?ae=PreFormAction&a=Reply&t=IPM.Note&id=RgAAAADdLIjMFCetSID7SIuJTzRoBwBr2%2bcoZdLKR5P0l2okqOPCAAAAsDW3AABr2%2bcoZdLKR5P0l2okqOPCAAAAsaCEAAAJ&pspid=_1324227270192_724854831 User host address: 41.184.0.52 User: bellz consulting EX Address: /o=Jaiz/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=bellz consulting SMTP Address: bellz.consulting@jaizbankplc.com OWA version: 14.1.218.13 Mailbox server: JZ-SRV-005.jaiz.local Exception Exception type: System.ArgumentException Exception message: imceaDomain must be a valid domain name. Call stack Microsoft.Exchange.Data.Storage.InboundConversionOptions.CheckImceaDomain(String imceaDomain) Microsoft.Exchange.Data.Storage.InboundConversionOptions..ctor(String imceaDomain) Microsoft.Exchange.Clients.Owa.Core.Utilities.CreateInboundConversionOptions(UserContext userContext) Microsoft.Exchange.Clients.Owa.Core.ReplyForwardUtilities.CreateReplyOrReplyAllItem(BodyFormat bodyFormat, Item item, ReplyForwardFlags flags, Boolean replyAll, UserContext userContext, StoreObjectId parentFolderId) Microsoft.Exchange.Clients.Owa.Core.ReplyForwardUtilities.CreateReplyItem(BodyFormat bodyFormat, Item item, ReplyForwardFlags flags, UserContext userContext, StoreObjectId parentFolderId) Microsoft.Exchange.Clients.Owa.Premium.Controls.ItemReplyPreFormAction.Execute(OwaContext owaContext, ApplicationElement& applicationElement, String& type, String& state, String& action) Microsoft.Exchange.Clients.Owa.Core.RequestDispatcher.DoFinalDispatch(OwaContext owaContext) Microsoft.Exchange.Clients.Owa.Core.RequestDispatcher.InternalDispatchRequest(OwaContext owaContext) Microsoft.Exchange.Clients.Owa.Core.RequestDispatcher.DispatchRequest(OwaContext owaContext) Microsoft.Exchange.Clients.Owa.Core.OwaRequestEventInspector.OnPostAuthorizeRequest(Object sender, EventArgs e) System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

did you find any solution coz i have the same issue with load balancer

Exchange SP1 rollup 6 Same Issue here -- removed Host name from bindings worked for a day -- then stopped working (OWA will not delete email) Owa light works. First get Event ID 3 on the CAS Server WebHost failed to process a request. Sender Information: System.ServiceModel.ServiceHostingEnvironment+HostingManager/30542218 Exception: System.ServiceModel.ServiceActivationException: The service '/EWS/exchange.asmx' cannot be activated due to an exception during compilation. The exception message is: A binding instance has already been associated to listen URI 'http://xxxxx.root.local/EWS/Exchange.asmx'. If two endpoints want to share the same ListenUri, they must also share the same binding object instance. The two conflicting endpoints were either specified in AddServiceEndpoint() calls, in a config file, or a combination of AddServiceEndpoint() and config. . ---> System.InvalidOperationException: A binding instance has already been associated to listen URI 'http://napca01.root.local/EWS/Exchange.asmx'. If two endpoints want to share the same ListenUri, they must also share the same binding object instance. The two conflicting endpoints were either specified in AddServiceEndpoint() calls, in a config file, or a combination of AddServiceEndpoint() and config. then Event 108 Outlook Web App couldn't connect Exchange Web Services due to a configuration error. Response code = "500". Bindings are simply http/https with no host names. Any Help would be appreciated.

Same issue with F5's and the EWS directory. Did you guys manage to find a work around for this please. Ta

My Issue was in the config file -- Unfortunately my 3rd party spam provider edited my config and that fixed it - not sure what was changed - will repost if i find the change.

This IIS permission config worked for me. Thanks Arnaud. For the subfolder ecp : anonymous : disabled basic : enabled digest : disabled Forms : disabled Windows : enabled ASP.NET : disabled For the subfolder EWS : anonymous : enabled basic : enabled digest : disabled Forms : disabled Windows : enabled ASP.NET : disabled For the subfolder owa : anonymous : disabled basic : enabled digest : disabled Forms : disabled Windows : enabled ASP.NET : disabled Soner Dinc

Worked for me . ThanksSoner Dinc