Issue WP customize preview getting error 500

[Space Monkey]

Server operating system version

Ubuntu 22

Plesk version and microupdate number

18.0.62

As at Vultr de plesk admin SE is eol I took one big server and transferred all my sites to that server with Plesk Pro. Migrating went easy but now on every site I have little kinks, for the most part I could figure out what the issue was.

But at one of my sites, in the WordPress customizer the preview doesn't load, I get a 500 error, when I click the home page I will see my site but any customization I do will not be instantly show where it normally should.

I checked the log but can't figure it out. It's allocated more than enough memory.

My other sites don't have this issue but have other weird things going on.

Anything comes to mind?

 

[Gabor H]

As at Vultr de plesk admin SE is eol I took one big server and transferred all my sites to that server with Plesk Pro. Migrating went easy but now on every site I have little kinks, for the most part I could figure out what the issue was.

But at one of my sites, in the WordPress customizer the preview doesn't load, I get a 500 error, when I click the home page I will see my site but any customization I do will not be instantly show where it normally should.

I checked the log but can't figure it out. It's allocated more than enough memory.

My other sites don't have this issue but have other weird things going on.

Anything comes to mind?

I had the similiar issue, and mine is solved following this thread:

Resolved - Mod_Security Error Response body too large

Hello, I use Plesk on Ubuntu and installed Mod_Security with Comodo ModSecurity subscription. I also set "Predefined Set Of Values" to THOROUGH. For large pages it returns an Error 500 page. The mod_security log file says: Message: Output filter: Response body too large (over limit of...

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