Problem with master using proxy but slave not

[Gaetano Giunta]

Hello

in our setup, the Jenkins master sits behind a firewall, and has a proxy configured (both to manage plugins and to reach the git repos where code is stored).

We are now trying to deploy slaves on the cloud, but it seems that they can not execute jobs: the master pushes to the the proxy configuration, and since they have no proxy running, git fails fetching the sources.
Apart from installing a local proxy on the slaves (ugly), is there any other solution?

I have found this plugin: https://wiki.jenkins-ci.org/display/JENKINS/Slave+HTTP+Proxy+Plugin but the doc is scarce and I can not find any panel to configure it...

Thanks
Gaetano