[Vad]

Hello. The site works but the forum does not open, error 500. How to fix it?

xampp-windows-x64-7.4.7-0-VC15

Apache/2.4.43 (Win64) OpenSSL/1.1.1g PHP/7.4.7 Server at my-site.localhost Port 80

[Vad]

I found how to solve the problem

I made the site available at the link:
http://mysite.com.localhost
The site worked but the forum gave an error 500.

Then I decided to return as it was
http://localhost/mysite.com

It worked. The forum has started to work.

[Robin W]

great !

[ellissharp]

Yeah, using subdomains helps in this case.