Turns out to be a denial of service on a machine in the same subnet. 
Machine in question has been sequestered. 

All of my puppet clients are hung. Fortunately there are only a few dozen 
as I'm having to touch each one, stop the puppet service, kill the hung 
process and rerun manually. 

On Monday, March 17, 2014 8:43:54 AM UTC-7, JonY wrote:
>
> Over the weekend there were some intermittent outages at our data center. 
> The puppet server would let clients connect but they would eventually time 
> out. 
>
> Unf this timeout wasn't handled gracefully and the clients would hang. 
> Doing a 'ps -ax | grep puppet' would show the service and the 'puppet 
> agent: applying configuration'. No activity available in the message log 
> for many hours though which indicated an unhappiness.
>
> If I killed the process and did 'puppet agent --test --debug' I could see 
> it get to where it tried to download the configuration. Doing this 
> interactively it would exit properly. If I restarted the service it would 
> stop and hang there.
>
> Server: CentOS 6.4 (x64). 
> puppet 3.4.0
> apache 2 / Passenger
>
> Clients: Debian 6.x 
> puppet 3.4.0
>

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