Silverlight WCF service binding error, "The remote server ..:Not found" - wcf

Question

this is my first post on here. Normally, I find my answer on other threads, but this time I'm really stumped.
I have a Silverlight App and I can connect to my webservice to send/receive data just fine, except for one page that I have. All the other pages, I can get data, make changes and send it back to the service. This one page, I try to send data to a service and it gives me a login box for the web server. Whether I put in my credentials or not, I get the error "The remote server returned an error: Not found." I have a combobox that gets loaded on Page Load event and it gets the data from the service just fine.
Any help is appreciated.
Here is my web.config file:
<configuration>
<system.web>
<authentication mode="Windows"/>
<compilation debug="true" strict="false" explicit="true" targetFramework="4.0" />
<customErrors mode="Off"/>
</system.web>
<system.serviceModel>
<behaviors>
<serviceBehaviors>
<behavior name="">
<serviceMetadata httpGetEnabled="true" />
<serviceDebug includeExceptionDetailInFaults="false" />
</behavior>
</serviceBehaviors>
</behaviors>
<bindings>
<customBinding>
<binding name="Network_Integrity_Control_Panel.Web.Service_AD_SQL.customBinding0">
<binaryMessageEncoding />
<httpTransport authenticationScheme="Negotiate"/>
</binding>
</customBinding>
</bindings>
<serviceHostingEnvironment
aspNetCompatibilityEnabled="true"
multipleSiteBindingsEnabled="true" />
<services>
<service name="Network_Integrity_Control_Panel.Web.Service_AD_SQL">
<endpoint address="" binding="customBinding" bindingConfiguration="Network_Integrity_Control_Panel.Web.Service_AD_SQL.customBinding0"
contract="Network_Integrity_Control_Panel.Web.Service_AD_SQL" />
<endpoint address="mex" binding="customBinding" bindingConfiguration="Network_Integrity_Control_Panel.Web.Service_AD_SQL.customBinding0"
contract="IMetadataExchange" />
</service>
</services>
</system.serviceModel>
</configuration>

Answer 1

Firstly , Welcome to SO .
It gives you a login box because your Authentication mode is Windows
What I see from your config your endpoint address is empty address="".
You should give the address in your code or in your config file.
Have a look at Microsoft resources http://msdn.microsoft.com/en-us/library/ff648505.aspx