AWG Blogs

Monday, September 17, 2012

Debugging Silverlight to SSL'd SharePoint .asmx from VS

As explained here, there are a few steps you need to take to enable this scenario, i.e. to get around:

An error occurred while trying to make a request to URI 'https://machinename/_vti_bin/Lists.asmx'. This could be due to attempting to access a service in a cross-domain way without a proper cross-domain policy in place, or a policy that is unsuitable for SOAP services. You may need to contact the owner of the service to publish a cross-domain policy file and to ensure it allows SOAP-related HTTP headers to be sent. This error may also be caused by using internal types in the web service proxy without using the InternalsVisibleToAttribute attribute. Please see the inner exception for more details.

Copy the following files to C:\inetpub\wwwroot\wss\VirtualDirectories\443: crossdomain.xml:
<?xml version="1.0" encoding="utf-8"?>
<!-- The file must be configured to allow access to the service from any other domain, 
or it is not recognized by Silverlight 4.
Save the crossdomain.xml file to the root of the domain where the service is hosted. 
If, for example, the service is hosted in, 
then the file must be located at
<!DOCTYPE cross-domain-policy SYSTEM 
  <allow-http-request-headers-from domain="*" headers="SOAPAction,Content-Type"/>
<?xml version="1.0" encoding="utf-8" ?>
      <allow-from http-request-headers="*">
              <domain uri="http://*"/>
              <domain uri="https://*"/>

        <resource include-subpaths="true" path="/"></resource>
Note the subpaths="true"! Then open https://machinename/clientaccesspolicy.xml in browser (BTW verify its wellformed xml), accept the security warning, then click Certificate Error, View Certificate, then Install Certificate..., Next, then "Place all certificates in the following store", select "Trusted Root Certification Authorities", OK. After that, you should be able to F5 your Visual Studio 2010 Silverlight 5 app, and load your data from the SSL enabled Sharepoint 2007 web service. Ref1, ref2