server migration - no active checks on server

[Tristis Oris]

Greetings.

all agents v2 using active checks.
old zabbix server was upgraded to 6.0 - it still works.
created new vm, clean 6.0 install, same discovery\registration configs, same server config.
both vm ubuntu 20.

next i shutdown old server, change ip on new vm to same, start > and no one agent joined.

agent log:

2022/02/18 14:49:43.010971 [101] no active checks on server [ip:10051]: host [name] not found

[Tristis Oris]

and solved. superfast) probably registration mistake somewhere.