I've gotten permission to use a Linux OS on my workplaces network, but I strongly suspect that IT has a product that they themselves don't realize is configured to block package managers. Over the last week I have tried Ubuntu and Fedora and spent close to 30 hours fiddling with proxy setting, and the only thing that doesn't work are apt and dnf. Everything else is fine. There are a number of centOS servers running running in the building, so out of frustration I installed centOS, and yum worked on the first try (with proxy settings). My guess is that the person who set up the servers long ago white listed yum or something. Is there some way I can prove one way or the other that our workplace proxy is or isn't interfering with apt or dnf?UPDATE:response when using wget instead of apt-install.wget http://ftp.riken.jp/Linux/ubuntu/dists/xenial-updates/InReleaseTcpdumping this request shows it does not contain the same Debian APT-HTTP header as it does when using APT. Everything appears to be normal. -----BEGIN PGP SIGNED MESSAGE-----Hash: SHA512Origin: UbuntuLabel: UbuntuSuite: xenialVersion: 16.04Codename: xenialDate: Thu, 21 Apr 2016 23:23:46 UTCArchitectures: amd64 arm64 armhf i386 powerpc ppc64el s390xComponents: main restricted universe multiverseDescription: Ubuntu Xenial 16.04MD5Sum: f52f354808b6658dcd8fc47c813cb087        501150562 Contents-amd64 605d6257d0144333d320d9aa750b19d2         32582143 Contents-arm64.gz... many many lines ommited... e201ab73d77c0208d5dcd4844b6215bc5e18b49d9f9b58d0fb627c47c0438ecd          9802268 universe/source/Sources.gz 06d5766fba7d0be3e2d0c801f26d10aa8b4e6e8618711445c1373b535777c84b         35812491 universe/source/Sources aefe5a7388a3e638df10ac8f0cd42e6c2947cc766c2f33a3944a5b4900369d1e          7727612 universe/source/Sources.xzAcquire-By-Hash: yes-----BEGIN PGP SIGNATURE-----Version: GnuPG v1.4.11 (GNU/Linux)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LkQz-----END PGP SIGNATURE-----
How to tell if package managers are being blocked by proxy
networking;apt;package management;yum