Trying to make a web service call to an HTTPS endpoint in my Silverlight application results in this error: \"Could not find a base address that matches scheme https for the
This does not look like an certificate validation error. It looks like a webservice configuration error. Can you post the config for your endpoint on the server?
WCF services don't support SSL by default, you need to enable transport security by creating a binding configuration and pointing your endpoint to it with the bindingConfiguration attribute.
Here is a sample binding configuration that supports SSL:
and your endpoint config would look like this: