Error502 page, how to debug it ?

[i5513]

Hello,

At apache logs, appear a not found url (/zabbix/errors/error502, referenced byh tr_status.php):

10.188.4.77 - - [25/Oct/2016:15:17:29 +0200] "GET /zabbix/errors/error502.html HTTP/1.1" 404 303 "https://monitor2.ti.sae.junta-andalucia.es/tr_status.php?ddreset=1" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:47.0) Gecko/20100101 Firefox/47.0"

I have search on zabbix code and zabbix bbdd, but I did not find where https://monitor2.ti.sae.junta-andalu....php?ddreset=1 can output /zabbix/errors/error502.html.

Do you know what can be happening to zabbix to appear this log on access_log ?

Not error was found on zabbix_server.log (502 is bad gateway, but I don't know how to debug this issue)

Can you help me ?

Thank you

[nobodysu]

Did you get any 502 error codes or just this line?
This means that someone tried to access '/zabbix/errors/error502.html' but its not there, which returned 404. Are you really having 502 issue?
Please post more 502's if you do.

[i5513]

[Solved] Sorry for the noise

It is not zabbix which is redirecting to error502.

Is an apache who are proxypassing to zabbix. I have to play with proxypass parameters.

I did not know about this proxypass until today, when I was to study which ip was the client that was requesting error502 page

Thank you very much