Puppet users - Nov 2014 - Puppet invoking yum with a proxy inconsistently

Greetings

This is my first post here, so hi everyone!

I have been using puppet to manage our fleet of 120 Macs for a few years 
now and have recently decided to setup a new TheForeman installation to 
manage our Linux servers...

The problem I have is yum refusing to download updated packages on some of 
these machines.
Some of our machines need to use a proxy to access the Internet while 
others don't.
When I run 'puppet agent --test' (as root) on the command-line all of my
clients work as expected.
Initially all servers are running CentOS 6.5 and have Puppet 3.7.2 (from 
the puppetlabs repo).
I was attempting to upgrade the clients to Puppet 3.7.3 when I realised I 
had this issue - (I have since updated some of them manually).

I will now only be talking about the machines that need a proxy..
I have http_proxy, https_proxy (and uppercase variants) configured in the 
.bash_profile for root and I am also able to use yum on the command-line of 
all these machines.

As I said, they are able apply new packages if I invoke the puppet command 
manually - but some of these servers will not get packages when run from 
the daemon. I get a classic, can't get on the network error:

Could not update: Execution of '/usr/bin/yum -d 0 -e 0 -y install 
puppet-3.7.3-1.el6' returned 1: Error Downloading Packages: 
puppet-3.7.3-1.el6.noarch: failure: puppet-3.7.3-1.el6.noarch.rpm from 
puppetlabs: [Errno 256] No more mirrors to try. Wrapped exception: 
Execution of '/usr/bin/yum -d 0 -e 0 -y install puppet-3.7.3-1.el6' 
returned 1: Error Downloading Packages: puppet-3.7.3-1.el6.noarch: failure: 
puppet-3.7.3-1.el6.noarch.rpm from puppetlabs: [Errno 256] No more mirrors 
to try.

I have now added the proxy configuration to yum.conf on one of the machines 
affected and this has fixed the problem. But I am perplxed as to the fact 
that this is only affecting some of my proxied machines.
I have looked in /etc/profile.d and not found any proxy entries (I also did 
a 'grep -r <proxyserver> /etc/' to find anything configured with
our
server).

Can anyone think of anywhere else I should look to work out why it **does** 
work on some of my machines?

I imagine it is something very simple that I have overlooked!

Thanks all


Merlin

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