I will install clients with ubuntu 16.04 over pxe boot and preseed. The installation stops after network building and mirror search (use internal mirror). After debug I found follow: The client makes a connection to steelix.canonical.com or other server from this farm on port 80. This is blocked in our environment. I open firewall for a test and now preseed work and machine is installed fully.
How can I deactivate this internet access or what must I do?
Best regards, Lars