Hi sccarduzio,
thanks for your reply, below you can see the whole request processing flow from debug logs.
I think that it was related to report processing requests.
I just changed IP addresses, as this is public forum.
Hope it helps.
[2018-11-12T16:53:04,749][DEBUG][t.b.r.a.ACL ] checking request:1033665454-1697438696#2268
[2018-11-12T16:53:04,749][DEBUG][t.b.r.a.b.r.i.AuthKeySyncRule] Basic auth header or auth key not present!
[2018-11-12T16:53:04,749][DEBUG][t.b.r.e.RequestInfo ] Discovered indices: .kibana
[2018-11-12T16:53:04,749][DEBUG][t.b.r.a.b.Block ] [Kibana] the request matches no rules in this block: { ID:1033665454-1697438696#2268, TYP:GetRequest, CGR:N/A, USR:[no basic auth header], BRS:false, KDX:null, ACT:indices:data/read/get, OA:1.1.1.2, DA:1.1.1.1, IDX:.kibana, MET:GET, PTH:/.kibana/doc/index-pattern%3Afafbef80-e433-11e8-b508-b7f3b0014377, CNT:<N/A>, HDR:{Connection=keep-alive, Content-Length=0, Host=1.1.1.1:9200}, HIS:[Kibana->[auth_key->false]] }
[2018-11-12T16:53:04,749][DEBUG][t.b.r.a.b.r.i.AuthKeySyncRule] Basic auth header or auth key not present!
[2018-11-12T16:53:04,749][DEBUG][t.b.r.a.b.Block ] [Logstash] the request matches no rules in this block: { ID:1033665454-1697438696#2268, TYP:GetRequest, CGR:N/A, USR:[no basic auth header], BRS:false, KDX:null, ACT:indices:data/read/get, OA:1.1.1.2, DA:1.1.1.1, IDX:.kibana, MET:GET, PTH:/.kibana/doc/index-pattern%3Afafbef80-e433-11e8-b508-b7f3b0014377, CNT:<N/A>, HDR:{Connection=keep-alive, Content-Length=0, Host=1.1.1.1:9200}, HIS:[Kibana->[auth_key->false]], [Logstash->[auth_key->false]] }
[2018-11-12T16:53:04,749][DEBUG][t.b.r.a.b.r.i.LdapAuthenticationAsyncRule] Basic auth header not present!
[2018-11-12T16:53:04,749][DEBUG][t.b.r.a.b.Block ] [users] the request matches no rules in this block: { ID:1033665454-1697438696#2268, TYP:GetRequest, CGR:N/A, USR:[no basic auth header], BRS:false, KDX:null, ACT:indices:data/read/get, OA:1.1.1.2, DA:1.1.1.1, IDX:.kibana, MET:GET, PTH:/.kibana/doc/index-pattern%3Afafbef80-e433-11e8-b508-b7f3b0014377, CNT:<N/A>, HDR:{Connection=keep-alive, Content-Length=0, Host=1.1.1.1:9200}, HIS:[Kibana->[auth_key->false]], [Logstash->[auth_key->false]], [users->[ldap_authentication->false]] }
[2018-11-12T16:53:04,750][DEBUG][r.suppressed ] path: /.kibana/doc/index-pattern%3Afafbef80-e433-11e8-b508-b7f3b0014377, params: {index=.kibana, id=index-pattern:fafbef80-e433-11e8-b508-b7f3b0014377, type=doc}
[2018-11-12T16:53:04,753][INFO ][t.b.r.a.ACL ] FORBIDDEN by default req={ ID:1033665454-1697438696#2268, TYP:GetRequest, CGR:N/A, USR:[no basic auth header], BRS:false, KDX:null, ACT:indices:data/read/get, OA:1.1.1.2, DA:1.1.1.1, IDX:.kibana, MET:GET, PTH:/.kibana/doc/index-pattern%3Afafbef80-e433-11e8-b508-b7f3b0014377, CNT:<N/A>, HDR:{Connection=keep-alive, Content-Length=0, Host=1.1.1.1:9200}, HIS:[Kibana->[auth_key->false]], [Logstash->[auth_key->false]], [users->[ldap_authentication->false]] }
Regards.