Smart proxy error

Problem:
Error while monitoring: getaddrinfo: Name or service not known
/usr/share/gems/gems/smart_proxy_monitoring-0.2.0/lib/smart_proxy_monitoring_icinga2/icinga2_client.rb:43:in initialize' /usr/share/gems/gems/smart_proxy_monitoring-0.2.0/lib/smart_proxy_monitoring_icinga2/icinga2_client.rb:43:in new’
/usr/share/gems/gems/smart_proxy_monitoring-0.2.0/lib/smart_proxy_monitoring_icinga2/icinga2_client.rb:43:in events_socket' /usr/share/gems/gems/smart_proxy_monitoring-0.2.0/lib/smart_proxy_monitoring_icinga2/icinga2_api_observer.rb:22:in block in monitor’
/usr/share/gems/gems/smart_proxy_monitoring-0.2.0/lib/smart_proxy_monitoring_icinga2/icinga2_api_observer.rb:19:in loop' /usr/share/gems/gems/smart_proxy_monitoring-0.2.0/lib/smart_proxy_monitoring_icinga2/icinga2_api_observer.rb:19:in monitor’
/usr/share/gems/gems/smart_proxy_monitoring-0.2.0/lib/smart_proxy_monitoring_icinga2/icinga2_api_observer.rb:58:in block in do_start' /usr/share/gems/gems/logging-2.3.0/lib/logging/diagnostic_context.rb:474:in block in create_with_logging_context’

Expected outcome:

Foreman and Proxy versions:

Foreman and Proxy plugin versions:

Distribution and version:

Other relevant data:

When I go to the smart proxy GUI I 've got tons of those errors repeated hundreds of times.

OS RH 8.6 and Foreman 3.3 + Katello 4.5

Do you have any idea ?

Thx in advance.