I ran into a really mad problem on a customer's local intranet running on Windows XAMPP (well yes it's not for production, I know, but wasn't my choice, but I have to deal with it).
The Symfony 5 application was running successfully on the development server (symfony serve), but on XAMPP it didn't want to work.
Problem loading page: The connection was reset (net::ERR_CONNECTION_RESET)
after it loaded and loaded...
[mpm_winnt:notice] [pid 7864:tid 548] AH00428: Parent: child process 1272 exited with status 3221225725 -- Restarting.
So I set the application up on other environments and it simply worked. Bot not on XAMPP on windows.
3 Things you should check!
1. If you're using symfony/webpack-encore-bundle, you should ensure that you run
yarn install yarn run build
or via npm
npm i npm run build
as I had a similar error when the CSS / JS was missing in a test.
2. Read / follow the issue I created here in https://github.com/symfony/monolog-bundle: https://github.com/symfony/monolog-bundle/issues/412
3. Increase the following values like this, as this will presumably fix the problem while it's still unclear why monolog needs these resources even in prod
<IfModule mpm_winnt_module> ThreadsPerChild 250 MaxConnectionsPerChild 0 ThreadStackSize 8388608 </IfModule>
as documented here:
I hope I was able to save you from this nightmare... really mad issue, which made me tired ;)
Also note this related Symfony Bug on windows: