The problem Adobe bulletins use FTP download links instead of http download links like other Adobe bulletins. Patch Management connects to FTP anonymously (unlike a browser) and actively (requires more ports than passive FTP) and this is blocked by most firewalls.
Whitelist the following address in any firewall that the NS is trying to communicate through: ftp://ftp.adobe.com/*. Also ensure that the firewall allows Annonymous and Active FTP communication. Wireshark captures will often reveal why a firewall is rejecting FTP access.