Changing the web.config takes the WCF service down? - wcf

Question

I have a simple WCF service hosted on IIS. Anytime I change the web.config file the service goes down and shows the following error:
Could not load file or assembly
'AutoMapper, Version=1.1.0.188,
Culture=neutral,
PublicKeyToken=be96cd2c38ef1005' or
one of its dependencies. Logon
failure: unknown user name or bad
password. (Exception from HRESULT:
0x8007052E)
To correct it, I need to delete all existing files and re-publish the WCF service. Re-publishing without deleting old files doesn't work, and neither does restarting the iis server.
Does anyone know why this happens? Or if there is an alternative to republishing the service to bring it back up? I am using IIS on Windows Server 2003, which I think is 6.0, and .Net framework 4.0
Further Error Info...
Assembly Load Trace: The following
information can be helpful to
determine why the assembly
'AutoMapper, Version=1.1.0.188,
Culture=neutral,
PublicKeyToken=be96cd2c38ef1005' could
not be loaded.
WRN: Assembly binding logging is
turned OFF. To enable assembly bind
failure logging, set the registry
value
[HKLM\Software\Microsoft\Fusion!EnableLog]
(DWORD) to 1. Note: There is some
performance penalty associated with
assembly bind failure logging. To turn
this feature off, remove the registry
value
[HKLM\Software\Microsoft\Fusion!EnableLog].
Stack Trace:
[FileLoadException: Could not load
file or assembly 'AutoMapper,
Version=1.1.0.188, Culture=neutral,
PublicKeyToken=be96cd2c38ef1005' or
one of its dependencies. Logon
failure: unknown user name or bad
password. (Exception from HRESULT:
0x8007052E)]
System.Reflection.RuntimeAssembly._nLoad(AssemblyName
fileName, String codeBase, Evidence
assemblySecurity, RuntimeAssembly
locationHint, StackCrawlMark&
stackMark, Boolean
throwOnFileNotFound, Boolean
forIntrospection, Boolean
suppressSecurityChecks) +0
System.Reflection.RuntimeAssembly.nLoad(AssemblyName
fileName, String codeBase, Evidence
assemblySecurity, RuntimeAssembly
locationHint, StackCrawlMark&
stackMark, Boolean
throwOnFileNotFound, Boolean
forIntrospection, Boolean
suppressSecurityChecks) +39
System.Reflection.RuntimeAssembly.InternalLoadAssemblyName(AssemblyName
assemblyRef, Evidence
assemblySecurity, StackCrawlMark&
stackMark, Boolean forIntrospection,
Boolean suppressSecurityChecks) +132
System.Reflection.RuntimeAssembly.InternalLoad(String
assemblyString, Evidence
assemblySecurity, StackCrawlMark&
stackMark, Boolean forIntrospection)
+144 System.Reflection.Assembly.Load(String
assemblyString) +28
System.ServiceModel.Activation.ServiceHostFactory.CreateServiceHost(String
constructorString, Uri[]
baseAddresses) +208
System.ServiceModel.HostingManager.CreateService(String
normalizedVirtualPath) +1440
System.ServiceModel.HostingManager.ActivateService(String
normalizedVirtualPath) +44
System.ServiceModel.HostingManager.EnsureServiceAvailable(String
normalizedVirtualPath) +615
[ServiceActivationException: The
service
'/Services/ClientLoginService.svc'
cannot be activated due to an
exception during compilation. The
exception message is: Could not load
file or assembly 'AutoMapper,
Version=1.1.0.188, Culture=neutral,
PublicKeyToken=be96cd2c38ef1005' or
one of its dependencies. Logon
failure: unknown user name or bad
password. (Exception from HRESULT:
0x8007052E).]
System.Runtime.AsyncResult.End(IAsyncResult
result) +679246
System.ServiceModel.Activation.HostedHttpRequestAsyncResult.End(IAsyncResult
result) +190
System.ServiceModel.Activation.HostedHttpRequestAsyncResult.ExecuteSynchronous(HttpApplication
context, String
routeServiceVirtualPath, Boolean
flowContext, Boolean ensureWFService)
+234 System.ServiceModel.Activation.HttpModule.ProcessRequest(Object
sender, EventArgs e) +355
System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
+148 System.Web.HttpApplication.ExecuteStep(IExecutionStep
step, Boolean& completedSynchronously)
+75