We have to NS server one is in DMZ zone and having internet and another on LAN which don't having internet access. All the ports are blocked expected 80 & 443 also UNC port 445 not allow between both zone but there is possibilities for FTP & SFTP Server. I have download the patches on DMZ server and now import these patches on internal NS.I request you to please help me to configure FTP or SFTP setting in patch management Core Services settings for import the all patches from DMZ server.