I have a server of my client and I deployed my WordPress website to it using an FTP account, when I try to open My WordPress website I keep getting 504 Bad gateway error as the following screenshot
I tried to add a simple HTML document and it works, also I have been attempting to add a test PHP file with phpinfo inside it and it works also, but the WordPress is not working
I also tried to disable app plugins and the same problem remains Can anyone advise me on what I should do?