I've been getting "Failed to destroy the record" errors regularly when I attempt to delete a host. If I try again after getting the error it usually works.

It looks like it's a problem while deleting the DHCP reservation:

2017-01-13 09:29:50 34b21bd9 [app] [I] Delete DHCP reservation for win7-test002.corp.bardel.ca-00:1a:4a:16:01:6f/10.49.60.101
2017-01-13 09:29:54 34b21bd9 [app] [W] Failed to parse response: 
 | Changed the current scope context to 10.49.60.0 scope.
 | 
 | Command completed successfully.
 |  -> 757: unexpected token at 'Changed the current scope context to 10.49.60.0 scope.
 | 
 | Command completed successfully.
 | '
2017-01-13 09:29:54 34b21bd9 [sql] [D] Using host queue
2017-01-13 09:29:54 34b21bd9 [sql] [W] Rolling back due to a problem: [#<Orchestration::Task:0x007f9a2e876b10 @name="Remove DHCP Settings for win7-test002.corp.bardel.ca", @status="failed", @priority=5, @action=[#<Nic::Managed id: 546, mac: "00:1a:4a:16:01:6f", ip: "10.49.60.101", type: "Nic::Managed", name: "win7-test002.corp.bardel.ca", host_id: 356, subnet_id: 1, domain_id: 1, attrs: {}, created_at: "2017-01-11 23:47:35", updated_at: "2017-01-11 23:47:35", provider: nil, username: nil, password: nil, virtual: false, link: true, identifier: "", tag: "", attached_to: "", managed: true, mode: "balance-rr", attached_devices: "", bond_options: "", primary: true, provision: true, compute_attributes: {"network"=>"00000000-0000-0000-0000-000000000009", "name"=>"nic1"}, execution: true, ip6: "", subnet6_id: nil>, :del_dhcp], @timestamp=2017-01-13 17:29:54 UTC>]

Production log of the whole host delete operation is attached.

Thanks.