Server returns error 503

[alexnixon2007]

Hello everyone.

So, here's the situation - I updated my zabbix-server from 5.4.3 to 6.0.10, did it following the instructions on these pages:

https://www.zabbix.com/documentation...pgrade/sources

https://www.zabbix.com/documentation...zabbix-daemons

Then I start the server by doing

systemctl start zabbix-server
Everything seems to be OK at this point, and systemctl status zabbix-server returns this:

Loaded: loaded (/usr/lib/systemd/system/zabbix-server.service; enabled; vendor preset: disabled)
Active: active (running) since Mon 2022-11-07 17:03:57 MSK; 18h ago
Process: 121913 ExecStop=/bin/kill -SIGTERM $MAINPID (code=exited, status=0/SUCCESS)
Process: 121915 ExecStart=/usr/local/sbin/zabbix_server -c $CONFFILE (code=exited, status=0/SUCCESS)
Main PID: 121917 (zabbix_server)
Tasks: 1 (limit: 48660)
Memory: 1.8M
CGroup: /system.slice/zabbix-server.service
└─121917 /usr/local/sbin/zabbix_server -c /etc/zabbix/zabbix_server.conf

However, when I open the address in the browser, I get a 503 error. Zabbix server log shows only this:

121917:20221107:170356.937 Starting Zabbix Server. Zabbix 6.0.10 (revision e35d7dceead).
121917:20221107:170356.937 ****** Enabled features ******
121917:20221107:170356.937 SNMP monitoring: YES
121917:20221107:170356.937 IPMI monitoring: NO
121917:20221107:170356.937 Web monitoring: YES
121917:20221107:170356.937 VMware monitoring: YES
121917:20221107:170356.937 SMTP authentication: YES
121917:20221107:170356.937 ODBC: NO
121917:20221107:170356.937 SSH support: NO
121917:20221107:170356.937 IPv6 support: YES
121917:20221107:170356.937 TLS support: NO
121917:20221107:170356.937 ******************************
121917:20221107:170356.937 using configuration file: /etc/zabbix/zabbix_server.conf

I have no idea what could cause this problem. Could you please help me with this, or at least come up with some possible causes...

Thanks in advance.

[Atsushi]

Web browser is accessing to a web server, such as Apache HTTP Server, not the Zabbix server daemon. Check your web server or php-fpm logs. Clearing your browser's cache may help.

[alexnixon2007]

Yes, turned out I had no oci8 installed at all, so I installed it and the problem was gone.