Hi! In the new zabbix installation, we encountered the following problem:

We create a new host with the Agent interface, add templates, include them in groups. After the addition, the host is unavailable.

I see similar errors in the logs:

  1892:20230410:171316.109 cannot send list of active checks to "10.0.0.98": host [co-forum] not found
  1889:20230410:171516.137 cannot send list of active checks to "10.0.0.98": host [co-forum] not found
  1892:20230410:171716.160 cannot send list of active checks to "10.0.0.98": host [co-forum] not found
  1886:20230410:171916.188 cannot send list of active checks to "10.0.0.98": host [co-forum] not found
  1890:20230410:172116.205 cannot send list of active checks to "10.0.0.98": host [co-forum] not found

Also, a new host cannot be found in the search bar by name on the Hosts page, but it can be found by ip.

The host becomes available only after restarting the service:

systemctl restart zabbix-server.service

After restarting, there are no errors in the logs and the search by name works correctly.

Please specify if you need to provide additional information?