In web interface shown exception:

Failed to save: failed to detect boot server: ERF50-9294 [Foreman::WrappedException]: Unable to find IP address for 'prov.ua.int' ([RuntimeError]: can't modify frozen Hash)

Trace:
http://pastebin.com/Mwn8Tgva

Api info about proxy:

{"ip":"172.16.160.10","environment_id":1,"environment_name":"production","last_report":"2015-04-29T08:33:48Z","mac":"00:50:56:ad:30:c8","realm_id":null,"realm_name":null,"sp_mac":null,"sp_ip":null,"sp_name":null,"domain_id":6,"domain_name":"ua.int","architecture_id":1,"architecture_name":"x86_64","operatingsystem_id":7,"operatingsystem_name":"Debian 7.8","subnet_id":null,"subnet_name":null,"sp_subnet_id":null,"ptable_id":null,"ptable_name":null,"medium_id":null,"medium_name":null,"build":false,"comment":"","disk":null,"installed_at":null,"model_id":1,"model_name":"VMware Virtual Platform","hostgroup_id":10,"hostgroup_name":"Foreman Proxy","owner_id":4,"owner_type":"User","enabled":true,"puppet_ca_proxy_id":1,"managed":false,"use_image":null,"image_file":"","uuid":null,"compute_resource_id":null,"compute_resource_name":null,"compute_profile_id":1,"compute_profile_name":"1-Micro-1CPU-512M-10GB","capabilities":["build"],"provision_method":"build","puppet_proxy_id":1,"certname":"prov.ua.int","image_id":null,"image_name":null,"created_at":"2014-12-22T21:54:29Z","updated_at":"2015-04-29T08:34:21Z","last_compile":"2015-04-29T08:33:52Z","last_freshcheck":null,"serial":null,"source_file_id":null,"puppet_status":0,"location_id":1,"location_name":"UA","name":"prov.ua.int","id":127,"parameters":[],"interfaces":[{"id":130,"name":"prov.ua.int","ip":"172.16.160.10","mac":"00:50:56:ad:30:c8","identifier":"eth0","primary":true,"provision":true,"type":"interface"}],"puppetclasses":[],"config_groups":[],"all_puppetclasses":[]}

{"ip":"172.16.160.133","environment_id":1,"environment_name":"production","last_report":"2015-04-29T08:32:01Z","mac":"00:50:56:ad:9b:43","realm_id":null,"realm_name":null,"sp_mac":null,"sp_ip":null,"sp_name":null,"domain_id":6,"domain_name":"ua.int","architecture_id":1,"architecture_name":"x86_64","operatingsystem_id":7,"operatingsystem_name":"Debian 7.8","subnet_id":3,"subnet_name":"172.16.160.0/24","sp_subnet_id":null,"ptable_id":8,"ptable_name":"Preseed default","medium_id":2,"medium_name":"Debian mirror","build":false,"comment":"","disk":"","installed_at":"2015-04-27T07:57:46Z","model_id":1,"model_name":"VMware Virtual Platform","hostgroup_id":25,"hostgroup_name":"Docker","owner_id":4,"owner_type":"User","enabled":true,"puppet_ca_proxy_id":1,"managed":true,"use_image":null,"image_file":"","uuid":null,"compute_resource_id":null,"compute_resource_name":null,"compute_profile_id":3,"compute_profile_name":"3-Normal-1CPU-2048M-40GB","capabilities":["build"],"provision_method":"build","puppet_proxy_id":1,"certname":"rancher04.ua.int","image_id":null,"image_name":null,"created_at":"2015-04-27T07:49:10Z","updated_at":"2015-04-29T08:32:33Z","last_compile":"2015-04-29T08:32:05Z","last_freshcheck":null,"serial":null,"source_file_id":null,"puppet_status":0,"location_id":1,"location_name":"UA","name":"rancher04.ua.int","id":233,"parameters":[],"interfaces":[{"id":197,"name":"rancher04.ua.int","ip":"172.16.160.133","mac":"00:50:56:ad:9b:43","identifier":"","primary":true,"provision":true,"type":"interface"}],"puppetclasses":[],"config_groups":[],"all_puppetclasses":[]}