Zabbix Issue - Host List Appears Blank (Error 500)

[khosyi99]

Subject: Zabbix Issue - Host List Appears Blank (Error 500)

Hi All,

I'm encountering an issue on Zabbix.

Whenever I try to view the list of hosts (Monitoring > Hosts), the page appears blank. Upon inspecting the browser's developer console and checking the Apache logs, I found a 500 Internal Server Error—but unfortunately, there are no detailed logs providing any clear clues about the root cause (please see the attached screenshot).

• Error: POST http://192.168.1.233/zabbix/zabbix.p...t.view.refresh 500 (Internal Server Error)
• 
• [21/Apr/2025:07:36:59 +0000] "POST /zabbix/zabbix.php?action=host.view.refresh HTTP/1.1" 500 639 "http://192.168.1.233/zabbix/zabbix.php?name=&ip=&dns=&port=&status=0&evaltype= 2&tags%5B0%5D%5Btag%5D=&tags%5B0%5D%5Boperator%5 D= 0&tags%5B0%5D%5Bvalue%5D=&maintenance_status=1&f il ter_name=&filter_show_counter=0&filter_custom_time =0&sort=name&sortorder=ASC&show_suppressed=0&acti o n=host.view&groupids%5B%5D=22" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36"

After further investigation, it seems the issue is related to a specific host group named "network". When I filter or access other host groups, the host list loads correctly. However, selecting or referencing the "network" group causes the blank screen and 500 error.



Has anyone experienced this before or have any insights on how to troubleshoot this?

Thanks in advance.
Dimas

[bbonno]

This doesn't look good! Some stored config makes Zabbix freak out...

Can you still list the Host Groups themselves?


I suspect you can, and there you can see which hosts are in that group. Using that info you should be able to narrow the issue down to a single host. Knowing that you can maybe fix the issue or just delete that one host, depending on what you learn along the way.