You should keep
kernel.serverUrl=http://libresource_dns_name_machine_A/
But I was wondering if the libresource server has access to your specific DNS ? (in order to resolved libresource_dns_name_machine_A)
Another way of checking of what is going wrong :
- Check the html page if it tries to retrieve stylesheet in a wrong location.
- Check the url in another browser on the server and on another computer...
But for the moment I don't see much what happen and why it doesn't work…