Some application resources served from HTTPS URL's where the web server (particularly Apache) uses Virtual Host with SNI (Server Name Indication) SSL extension, could get FailedDownloadException if the server configuration is not done corretly.
If the cause is not obvious, turn on full tracing (see section ...) and check for the underlying cause. If the cause is SSLProtocolException: handshake alert: unrecognized_name, it is likely that the virtual host configuration for SNI was not done correctly or has typo. To correct, make sure ServerName directive are configured properly as specified by http://wiki.apache.org/httpd/NameBasedSSLVHostsWithSNI.
For more information see discussion on bug http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7127374.