Error 500 while running WCF service on IIS 7.5 - wcf

Question

Maybe someone can help me.
I'm hosting WCF service on IIS. The .svc file is accessible from a browser. It works locally but when I publish on the server and I want to call a method from my client, I always got an HTTP Status 500 from the server.
Here is my web.config file
<?xml version="1.0"?>
<configuration>
<system.web>
<compilation debug="true" targetFramework="4.0" />
<!-- Allow receiving of large files, maxRequestLength is in kB -->
<httpRuntime maxRequestLength="2097151" executionTimeout="300" />
</system.web>
<system.serviceModel>
<services>
<service behaviorConfiguration="WebServices.MVSWebServicesBehavior"
name="WebServices.MVSWebServices">
<endpoint address="" binding="basicHttpBinding" contract="WebServices.MVSWebServices_I" />
<endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" />
<host>
<baseAddresses>
<add baseAddress="http://<ipaddr>/WebServices/" />
</baseAddresses>
</host>
</service>
</services>
<behaviors>
<serviceBehaviors>
<behavior name="WebServices.MVSWebServicesBehavior">
<!-- To avoid disclosing metadata information, set the value below to false and remove the metadata endpoint above before deployment -->
<serviceMetadata httpGetEnabled="true"/>
<!-- To receive exception details in faults for debugging purposes, set the value below to true. Set to false before deployment to avoid disclosing exception information -->
<serviceDebug includeExceptionDetailInFaults="true"/>
</behavior>
</serviceBehaviors>
</behaviors>
</system.serviceModel>
<system.webServer>
<modules runAllManagedModulesForAllRequests="true"/>
</system.webServer>
</configuration>
The log file only shows me
2013-06-17 13:55:44 <ipaddr> POST /WebServices/MVSWebServices.svc - 80 - <ipaddr> ksoap2-android/2.6.0+ 500 0 0 2121
So I tried Failed Request Tracing on the server and I got (I can provide the full trace if necessary):
MODULE_SET_RESPONSE_ERROR_STATUS
ModuleName IsapiModule
Notification 128
HttpStatus 500
HttpReason Internal Server Error
HttpSubStatus 0
ErrorCode 0
ConfigExceptionInfo
Notification EXECUTE_REQUEST_HANDLER
ErrorCode The operation completed successfully. (0x0)
Four days I'm banging my head against walls, any help would be appreciated :)
PS: I'm using Windows Server 2008 R2 with IIS 7.5
Edit1:
After enabling WCF Tracing, there's the resulting error message:
The message with Action 'http://tempuri.org/MVSWebService_I/getTimestamp' cannot be processed at the receiver, due to a ContractFilter mismatch at the EndpointDispatcher. This may be because of either a contract mismatch (mismatched Actions between sender and receiver) or a binding/security mismatch between the sender and the receiver. Check that sender and receiver have the same contract and the same binding (including security requirements, e.g. Message, Transport, None).
The contract mismatch make me think to verify the SOAP Action in WSDL file:
http://tempuri.org/MVSWebServices_I/getTimestamp
And then in my client (Android application):
http://tempuri.org/MVSWebService_I/getTimestamp
Just to spot a missing s in my action !! I added the missing letter to the SOAP action and everything worked well.
So that's it, this missing letter costed me 4 days but I still love programming :D
Thank you for your help.

Answer 1

Can you hit it if you run the browser on the server as opposed to running it locally trying to hit the server?