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**tim.mooney** · 15-06-2020, 23:02

The web interface (front end) relies mainly on a web server and PHP + modules. It's largely independent from the zabbix-server processes. The front end can be "working" even when zabbix-server is not functioning, and zabbix-server can be running fine (collecting data, detecting problems, generating alerts, etc.) even when the front end is offline.

Do you have PHP loaded, with all the necessary modules, on the host that is going to host your Zabbix web interface? Are there error messages in /var/log/httpd/error_log ? Are there error messages in any PHP logs?

Did you run the one-time web setup, described in section 2 of https://www.zabbix.com/documentation...lation/install ?

**LucasB** · 16-06-2020, 11:33

Thank you for your reply,

I did run the one time web setup, the 'Check of prerequisites' (section 2 - step 2) was all OK.

There is no error related in /var/log/httpd/error_log

Code:

[root@hpc-mon ~]# cat /var/log/httpd/error_log
[Mon Jun 15 15:55:25.707871 2020] [suexec:notice] [pid 2727:tid 140447761721600] AH01232: suEXEC mechanism enabled (wrapper: /usr/sbin/suexec)
[Mon Jun 15 15:55:25.758381 2020] [lbmethod_heartbeat:notice] [pid 2727:tid 140447761721600] AH02282: No slotmem from mod_heartmonitor
[Mon Jun 15 15:55:25.759699 2020] [http2:warn] [pid 2727:tid 140447761721600] AH02951: mod_ssl does not seem to be enabled
[Mon Jun 15 15:55:25.769228 2020] [mpm_event:notice] [pid 2727:tid 140447761721600] AH00489: Apache/2.4.37 (centos) configured -- resuming normal operations
[Mon Jun 15 15:55:25.769284 2020] [core:notice] [pid 2727:tid 140447761721600] AH00094: Command line: '/usr/sbin/httpd -D FOREGROUND'
[Mon Jun 15 16:07:19.076416 2020] [autoindex:error] [pid 3425:tid 140446932084480] [client ::1:56786] AH01276: Cannot serve directory /var/www/html/: No matching DirectoryIndex (index.html,index.php) found, and server-generated directory index forbidden by Options directive

But their is an error related in php

Code:

[16-Jun-2020 11:28:19 Europe/Paris] PHP Fatal error: Uncaught Error: Call to undefined function json_encode() in /var/www/html/zabbix/app/controllers/CControllerDashboardView.php:284
Stack trace:
#0 /var/www/html/zabbix/app/controllers/CControllerDashboardView.php(101): CControllerDashboardView::getWidgets(Array)
#1 /var/www/html/zabbix/include/classes/mvc/CController.php(339): CControllerDashboardView->doAction()
#2 /var/www/html/zabbix/include/classes/core/ZBase.php(488): CController->run()
#3 /var/www/html/zabbix/include/classes/core/ZBase.php(194): ZBase->processRequest(Object(CRouter))
#4 /var/www/html/zabbix/include/config.inc.php(25): ZBase->run('default')
#5 /var/www/html/zabbix/zabbix.php(21): require_once('/var/www/html/z...')
#6 {main}
thrown in /var/www/html/zabbix/app/controllers/CControllerDashboardView.php on line 284

**LucasB** · 16-06-2020, 11:37

Ok i just needed to install php-json and it worked

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Blank dashboard after login

Blank dashboard after login

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