cannot send list of active checks to "a.b.c.d": host [5f255917c795] not found

[robionair]

Hello, I just installed the last containered version of zabbix 6.4 alpine containers over an ubuntu 20.04 VM.
I activated the containers postgres:14-alpine, zabbix/zabbix-server-pgsql:alpine-6.4-latest, zabbix/zabbix-web-apache-pgsql:alpine-6.4-latest, zabbix/zabbix-agent:alpine-6.4-latest
I opened the GUI and got the problem "zabbix agent is not available (for 3m)
By looking at server log, I saw the errors for many times:
254:20230323:164319.750 cannot send list of active checks to "172.35.1.163": host [e0db4104fac6] not found
By looking at agent log, I saw the errors
6228:20230323:164219.744 Unable to connect to [zabbix-server]:10051 [cannot connect to [[zabbix-server]:10051]: [111] Connection refused]
6228:20230323:164219.744 Active check configuration update started to fail
6227:20230323:164248.697 failed to accept an incoming connection: connection from "172.35.1.161" rejected, allowed hosts: "zabbix-server"
6228:20230323:164319.750 Successfully sent heartbeat message to [zabbix-server]:10051
6228:20230323:164319.750 Active check configuration update from [zabbix-server:10051] is working again
6228:20230323:164319.750 no active checks on server [zabbix-server:10051]: host [e0db4104fac6] not found

I didn't modify anything on the files env_vars/.env*

What can I check ?