504 Gateway error timeout

hello, guys i am using an application call vtiger, however time to time it become very slow when loading and then
“The gateway did not receive a timely response from the upstream server or application.”
i read i have to change max time outs. where is that on UI? cant find it. thanks (once again new to hestia)

Check /etc/apache2/apache2.conf / /etc/nginx/nginx.conf via CLI

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so there is no way to do it with the UI?

No, only over cli.

ok, thanks

Under the advanced options you can edit the file via UI.