I followed the tutorial to install Perfect Server Debian with Nginx Dovecot with ISPConfig 3.2. I successfully installed RoundCube, but not from the source code (tar.gz) rather through apt install. I am able to use RoundCube through port 8081, and can log in to read emails. However, when I create the domain webmail.host through ISPConfig and fill in the Nginx Directives according to the example, I can only display the RoundCube homepage. After logging in, it shows: 404 Not Found nginx/1.22.1"
Which guide did you use? I'd recommend using the autoinstaller: https://www.howtoforge.com/ispconfig-autoinstall-debian-ubuntu/
