On Red Hat Satellite 6.1 Client Puppet certificate signing is fails with " Unable to sign PuppetCA certificate for contenthost1.example.com ([RestClient::NotAcceptable]: 406 Not Acceptable)" error on the web-ui.

Issue

• Trying to sign the Puppet client certificate on the Satellite UI throws in an error:

 Unable to sign PuppetCA certificate for contenthost1.example.com ([RestClient::NotAcceptable]: 406 Not Acceptable)

• Can see below error message in /var/log/foreman/production.log on satellite-6 after puppet certificate signing for a client fails :

 2015-10-27 09:21:16 [W] Operation FAILED: ERF12-9815 [ProxyAPI::ProxyException]: Unable to sign PuppetCA certificate for contenthost1.example.com ([RestClient::NotAcceptable]: 406 Not Acceptable) for proxy https://satellite.example.com:9090/puppet/ca
2015-10-27 09:23:01 [I]   Parameters: {"authenticity_token"=>"JQnlWCRmaDLapz/Q2Fel48WpO9YI8NSNGj2C6ZkcZ5E=", "class"=>"delete", "state"=>"pending", "smart_proxy_id"=>"satellite-proxy.example.com", "id"=>"contenthost1.example.com"}
2015-10-27 09:30:16 [I]   Parameters: {"authenticity_token"=>"JQnlWCRmaDLapz/Q2Fel48WpO9YI8NSNGj2C6ZkcZ5E=", "state"=>"pending", "smart_proxy_id"=>"satellite-proxy.example.com", "id"=>"contenthost1.example.com"}
2015-10-27 09:30:18 [W] Operation FAILED: ERF12-9815 [ProxyAPI::ProxyException]: Unable to sign PuppetCA certificate for contenthost1.example.com ([RestClient::NotAcceptable]: 406 Not Acceptable) for proxy https://satellite.example.com:9090/puppet/ca