We had lot of problem with this bug Shopware production template – Docker and Linux – 500 internal server error for Frontend – production template / productive mode – 6.3.4.0 – Frontend not working Backend is working.
Shopware Frontend was working
Shopware Backend shows internal server error
Used Linux and Docker
The solution
The reason was only Port 80 is allowed in production template. All other Ports do not work.
Please find more detailed information on our blog
https://www.konvis.de/neuigkeiten/shopware/en-solution-shopware-6-3-4-0-production-template-docker-and-linux-500-internal-server-error-for-frontend-backend-is-working/