I'm using apt-cacher-ng to cache package downloads for my LAN. I'm also using the Ubuntu Beta fonts PPA which requires a password for access. I keep getting the error
bjorn@bjorn-laptop-natty:~$ sudo apt-get update
[sudo] password for bjorn:
Ign http://extras.ubuntu.com natty InRelease
<snip>
Ign https://private-ppa.launchpad.net natty/main amd64 Packages/DiffIndex
Ign https://private-ppa.launchpad.net natty/main TranslationIndex
Err https://private-ppa.launchpad.net natty/main Sources
Failed to connect to 0.0.7.209: Invalid argument
Err https://private-ppa.launchpad.net natty/main amd64 Packages
Failed to connect to 0.0.7.209: Invalid argument
Ign https://private-ppa.launchpad.net natty/main Translation-en_US
Ign https://private-ppa.launchpad.net natty/main Translation-en
Hit http://us.archive.ubuntu.com natty Release.gpg
Hit http://us.archive.ubuntu.com natty-updates Release.gpg
<snip>
Ign http://security.ubuntu.com natty-security/universe Translation-en
Fetched 72 B in 7s (10 B/s)
W: Failed to fetch https://private-ppa.launchpad.net/ubuntu-font-beta-testing/ppa/ubuntu/dists/natty/main/source/Sources Failed to connect to 0.0.7.209: Invalid argument
W: Failed to fetch https://private-ppa.launchpad.net/ubuntu-font-beta-testing/ppa/ubuntu/dists/natty/main/binary-amd64/Packages Failed to connect to 0.0.7.209: Invalid argument
E: Some index files failed to download. They have been ignored, or old ones used instead.
It works properly if I disable using apt-cacher-ng. It seems weird that it says that it is trying to connect to 0.0.7.209; I'm pretty sure that's not the address of launchpad's PPAs. I don't always want to be changing settings just to check for updates, so how can I make apt-cacher-ng and a passworded PPA work together?