*System Information Version 1.2.0

When attempting to create a new VMware instance, on the network page, the system logs show a 500 error when attempting to query an address from out DHCP server:

Started POST "/subnets/freeip" for 10.1.10.178 at 2013-10-30 12:52:44 -0400
Processing by SubnetsController#freeip as */*
Parameters: {"subnet_id"=>"1", "host_mac"=>""}
Failed to fetch a free IP from our proxy: 500 Internal Server Error
Completed 200 OK in 1052ms (ActiveRecord: 1.1ms)

On the subnet import in the smart proxy page I get another 500 internal error with the full trace of:

RestClient::InternalServerError
500 Internal Server Error
lib/proxy_api/resource.rb:70:in `get'
lib/proxy_api/dhcp.rb:12:in `subnets'
app/models/subnet.rb:115:in `import'
app/controllers/subnets_controller.rb:68:in `import'
lib/foreman/thread_session.rb:31:in `clear_thread

This just stopped working a week or two ago after functioning fine for months.