If I reference a schema from an external https server with basic auth, the validation could not load it:

example:
<?xml version="1.0"?>
<node 1 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xmlns="https://test.com" 
    xsi:schemaLocation="https://test.com https://test.com/test.xsd">

validate gives following errors:
XML validation started.

Checking file:/C:/Users/xxx/Downloads/test.xml...
Referenced entity at "https://test.com/test.xsd".
schema_reference.4: Failed to read schema document 'https://test.com/test.xsd', because 
1) could not find the document;
2) the document could not be read; 
3) the root element of the document is not <xsd:schema>. [2] 
cvc-elt.1: Cannot find the declaration of element 'issue'. [2] 



it defined via http it works:
<?xml version="1.0"?>
<node 1 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xmlns="https://test.com" 
    xsi:schemaLocation="https://test.com http://test.com/test.xsd">

XML validation started.

Checking file:/C:/Users/if/Downloads/control%20(2).xml...
Referenced entity at "http://th.devel.dscc.at/pdf4dps-control/api/control2.xsd".
XML validation finished.

but the "https" xsd is reachable via webbrowser.
I have already tried to add the not self signed certificate to the jre keychain.

The same problem occurs also on OSX with Netbeans 7.3.1