WCF Web Service not working after IIS restart - wcf

Question

I have a web service running on IIS 7.5
Whenever I restart the IIS or the AppPool of the website this web service is running I am getting the error message below. Then I found out that, if I change the complilation version (either from 4.5 to 4.0 or if it is 4.0 to 4.5) and save the web.config file then it starts working regularly. This is really weird. Can anybody help me on this please.
web.config:
<configuration>
<system.web>
<compilation debug="true" targetFramework="4.5"/>
<httpRuntime targetFramework="4.5"/>
</system.web>
<connectionStrings>
<add name="NetDBEntities" connectionString="metadata=res://*/EFatura.csdl|res://*/EFatura.ssdl|res://*/EFatura.msl;provider=System.Data.SqlClient;provider connection string="data source=***********;initial catalog=*****;persist security info=True;user id=sa;password=***************;MultipleActiveResultSets=True;App=NSEfatLib"" providerName="System.Data.EntityClient" />
</connectionStrings>
<system.serviceModel>
<services>
<service name="NSEfatLib.NSEfatEntryPoint">
<endpoint address="Cari" binding="basicHttpBinding" bindingConfiguration=""
name="Cari" contract="NSEfatLib.ICari" />
<endpoint address="Stok" binding="basicHttpBinding" bindingConfiguration=""
name="Stok" contract="NSEfatLib.IStok" />
<endpoint address="FaturaIslemler" binding="basicHttpBinding"
bindingConfiguration="" name="FaturaIslemler" contract="NSEfatLib.IFaturaIslemler" />
<endpoint address="DefterIslemler" binding="basicHttpBinding"
bindingConfiguration="" name="DefterIslemler" contract="NSEfatLib.IDefterIslemler" />
</service>
</services>
<behaviors>
<serviceBehaviors>
<behavior>
<serviceMetadata httpGetEnabled="true" httpsGetEnabled="true"/>
<serviceDebug includeExceptionDetailInFaults="true"/>
</behavior>
</serviceBehaviors>
</behaviors>
<protocolMapping>
<add binding="basicHttpsBinding" scheme="https"/>
</protocolMapping>
<serviceHostingEnvironment aspNetCompatibilityEnabled="true" multipleSiteBindingsEnabled="true"/>
</system.serviceModel>
<system.webServer>
<modules runAllManagedModulesForAllRequests="true"/>
<directoryBrowse enabled="true"/>
</system.webServer>
</configuration>
Error Message:
The type 'NSEfatLib.NSEfatEntryPoint', provided as the Service
attribute value in the ServiceHost directive, or provided in the
configuration element
system.serviceModel/serviceHostingEnvironment/serviceActivations could
not be 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.
Exception Details: System.InvalidOperationException: The type
'NSEfatLib.NSEfatEntryPoint', provided as the Service attribute value
in the ServiceHost directive, or provided in the configuration element
system.serviceModel/serviceHostingEnvironment/serviceActivations could
not be found.
Source Error:
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.
Stack Trace:
[InvalidOperationException: The type 'NSEfatLib.NSEfatEntryPoint',
provided as the Service attribute value in the ServiceHost directive,
or provided in the configuration element
system.serviceModel/serviceHostingEnvironment/serviceActivations could
not be found.]
System.ServiceModel.Activation.ServiceHostFactory.CreateServiceHost(String
constructorString, Uri[] baseAddresses) +122516
System.ServiceModel.HostingManager.CreateService(String
normalizedVirtualPath, EventTraceActivity eventTraceActivity) +1451
System.ServiceModel.HostingManager.ActivateService(ServiceActivationInfo
serviceActivationInfo, EventTraceActivity eventTraceActivity) +76
System.ServiceModel.HostingManager.EnsureServiceAvailable(String
normalizedVirtualPath, EventTraceActivity eventTraceActivity) +901
[ServiceActivationException: The service '/Service.svc' cannot be
activated due to an exception during compilation. The exception
message is: The type 'NSEfatLib.NSEfatEntryPoint', provided as the
Service attribute value in the ServiceHost directive, or provided in
the configuration element
system.serviceModel/serviceHostingEnvironment/serviceActivations could
not be found..] System.Runtime.AsyncResult.End(IAsyncResult result)
+650220 System.ServiceModel.Activation.HostedHttpRequestAsyncResult.End(IAsyncResult
result) +210733
System.Web.CallHandlerExecutionStep.OnAsyncHandlerCompletion(IAsyncResult
ar) +282
Event Log Entry:
System.ServiceModel.ServiceHostingEnvironment+HostingManager/62476613
System.ServiceModel.ServiceActivationException: The service
'/Service.svc' cannot be activated due to an exception during
compilation. The exception message is: The type
'NSEfatLib.NSEfatEntryPoint', provided as the Service attribute value
in the ServiceHost directive, or provided in the configuration element
system.serviceModel/serviceHostingEnvironment/serviceActivations could
not be found.. ---> System.InvalidOperationException: The type
'NSEfatLib.NSEfatEntryPoint', provided as the Service attribute value
in the ServiceHost directive, or provided in the configuration element
system.serviceModel/serviceHostingEnvironment/serviceActivations could
not be found. at
System.ServiceModel.Activation.ServiceHostFactory.CreateServiceHost(String
constructorString, Uri[] baseAddresses) at
System.ServiceModel.ServiceHostingEnvironment.HostingManager.CreateService(String
normalizedVirtualPath, EventTraceActivity eventTraceActivity) at
System.ServiceModel.ServiceHostingEnvironment.HostingManager.ActivateService(ServiceActivationInfo
serviceActivationInfo, EventTraceActivity eventTraceActivity) at
System.ServiceModel.ServiceHostingEnvironment.HostingManager.EnsureServiceAvailable(String
normalizedVirtualPath, EventTraceActivity eventTraceActivity) --- End
of inner exception stack trace --- at
System.ServiceModel.ServiceHostingEnvironment.HostingManager.EnsureServiceAvailable(String
normalizedVirtualPath, EventTraceActivity eventTraceActivity) at
System.ServiceModel.ServiceHostingEnvironment.EnsureServiceAvailableFast(String
relativeVirtualPath, EventTraceActivity eventTraceActivity) w3wp
5028

Answer 1

Interestingly above error was fired when the web service was precompiled. I tried the service to run regularly (without precomopiling) and the issue is not appearing anymore.
I was using a library within the web service, so practically the web service itself did not have any code at all. Maybe that is the reason. Anyways, as there is no code, no precompilation is fine too.