maxClockSkew does not get higher than 5 minutes?!(Even if I set it explicitly) - wcf-binding

Question

I'm trying to set the maxClockSkew of my WCF Service to something higher than 5 minutes(default)but I'm not succeding. It looks that there's something wrong when I want to set it together with the authenticationMode="UserNameOverTransport". I need this because my server is running under https and I will authenticate the user using a custom authentication Provider. There's no errors on the server initialization, but the value does not change from 5 minutes(00:05:00)... And I always get the annoying message from the client side saying
The security timestamp is invalid because its creation time ('2011-06-24T15:31:22.338Z') is in the future. Current time is '2011-06-24T15:21:30.923Z' and allowed clock skew is '00:05:00'.
Here you can see my whole Service config file:
<?xml version="1.0"?> <configuration>
<system.web>
<compilation debug="true"/>
</system.web>
<system.serviceModel>
<serviceHostingEnvironment multipleSiteBindingsEnabled="true">
</serviceHostingEnvironment>
<services>
<service name="MYSERVICE">
<endpoint address="" binding="customBinding" bindingConfiguration="HTTP" contract="MYCONTRACT">
<identity>
<dns value="https://localhost"/>
</identity>
</endpoint>
<endpoint address="mex" binding="mexHttpsBinding" contract="IMetadataExchange"/>
<host>
<baseAddresses>
<add baseAddress="https://localhost/service"/>
</baseAddresses>
</host>
</service>
</services>
<behaviors>
<serviceBehaviors>
<behavior>
<serviceMetadata httpGetEnabled="False" httpsGetEnabled="True" />
<serviceDebug includeExceptionDetailInFaults="False"/>
<serviceCredentials>
<userNameAuthentication userNamePasswordValidationMode="Custom"
customUserNamePasswordValidatorType="CUSTOMServiceCredentialsValidator, ASSEMBLY" />
</serviceCredentials>
</behavior>
</serviceBehaviors>
</behaviors>
<bindings>
<customBinding>
<binding name="HTTP">
<transactionFlow />
<textMessageEncoding>
<readerQuotas maxStringContentLength="2147483647"/>
</textMessageEncoding>
<security authenticationMode="SecureConversation">
<localClientSettings maxClockSkew="00:10:00"/>
<localServiceSettings maxClockSkew="00:10:00"/>
<secureConversationBootstrap authenticationMode="UserNameOverTransport">
<localClientSettings maxClockSkew="00:10:00"/>
<localServiceSettings maxClockSkew="00:10:00"/>
</secureConversationBootstrap>
</security>
<httpsTransport maxReceivedMessageSize="2147483647" maxBufferSize="2147483647"/>
</binding>
</customBinding>
</bindings>
</system.serviceModel>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>
</startup>
What Am I missing? Does anyone faced this issue? I did not found many people facing this situation.
Thanks In Advance
Pedro

Answer 1

You need to set up explicitly a new binding:
http://msdn.microsoft.com/en-us/library/aa738468.aspx
HTH