Builds are sometimes failing on Jenkins because it is unable to connect to the Debian and Ubuntu mirrors at http://ftp.osuosl.org/pub/. For example: https://jenkins.torproject.org/job/tor-ci-linux-0.2.8/ARCHITECTURE=amd64,SUITE=wheezy/23/console Debian has the [HTTP mirror redirector](http://httpredir.debian.org/) which could solve the problem by automatically picking different mirrors. Ubuntu has a similar solution by using the [global archive](https://help.ubuntu.com/community/Repositories/CommandLine#Explanation_of_the_Repository_Format).