LinuxQuestions.org - Getting 504 [Errno -2] Name or service not known when doing apt-download

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Getting 504 [Errno -2] Name or service not known when doing apt-download

I am attempting to download my packages for a system that is offline.
I generated the signature file from that system, moved it to a system that has internet connectivity. Used "apt-offline get deb-upgrade.sig --bundle deb-upgrade.zip --threads 2"
I am getting this type of message on everything it tries to download:
ERROR: http://mirrors.kernel.org/debian/dis...pdates/Release - 504 - [Errno -2] Name or service not known.
ERROR: Will still try with other package uris

I know this system has connectivity to the internet because I just updated it.

The zip file is generated with nothing in it.

can the online system connect to http://mirrors.kernel.org ?