no active checks on server [:10051]: host [] not found

[falopez]

Hi! I have a problem with an agent and a zabbix proxy conection. I have already check the hostname in the conf file, I have check if there is conection through 10050 and 10051 ports by telnet, I have check the hostname file to see if it is the same name when executing hostname command, I have changed the Server and ServerActive in the conf file to the IP and DNS multiple times, I have tried to type the name of the host in hostname parameter instead of using HostnameItem=system.hostname, the hostname is the same in zabbix frontend and the template selected is Linux by zabbix agent but logs remains the same:

138929:20240304:183919.369 Starting Zabbix Agent []. Zabbix 6.4.12 (revision dba2d5bd63b).
138929:20240304:183919.372 **** Enabled features ****
138929:20240304:183919.374 IPv6 support: YES
138929:20240304:183919.377 TLS support: YES
138929:20240304:183919.379 **************************
138929:20240304:183919.382 using configuration file: /etc/zabbix/zabbix_agentd.conf
138929:20240304:183919.384 agent #0 started [main process]
138930:20240304:183919.387 agent #1 started [collector]
138931:20240304:183919.389 agent #2 started[listener #1]
138932:20240304:183919.392 agent #3 started[listener #2]
138933:20240304:183919.395 agent #4 started[listener #3]
138934:20240304:183919.398 agent #5 started [active checks #1]
138934:20240304:183919.404 no active checks on server [:10051]: host [] not found

I do not have any idea of what could be happening if I have already checked all about ports and hostname.

Could you help me please?

[Enes]

Have you been able to solve the problem? I've had the same problem for a long time.

[Brambo]

Have you been able to solve the problem? I've had the same problem for a long time.

It's very simple to fix, look in your agent.conf (or agent2) on your server. Look for fields like HostName and ServerActive.
The HostName must be in your zabbix hosts (case sensitive) and I expect the ServerActive part is already setup because you get the reply that there are no checks

[Enes]

Brambo After almost 2 months, just now I solved the problem.