Hi
please redo your changes over the Plesk - Control - Panel for your nginx directive and save the settinsg without any additional nginx directives.
Afterwards, please make a copy of your current "nginx.conf" ( or "last_ip_default.conf", if this is the standard domain for your defined IP ) with the command:
mv /var/www/vhosts/system/YOUR_DOMAIN.COM/conf/nginx.conf /var/www/vhosts/system/YOUR_DOMAIN.COM/conf/nginx.conf.saved_for_backup
To continue, open the file
/var/www/vhosts/system/YOUR_DOMAIN.COM/conf/nginx.conf and add the following lines
after each of these definition:
error_log "/var/www/vhosts/system/YOUR_DOMAIN.COM/logs/proxy_error_log";
Code:
if ($host ~* ^YOUR_DOMAIN.COM$) {
rewrite ^(.*)$ https://YOUR_DOMAIN.COM.de$1 permanent;
}
Save your edits and reload/restart nginx, please. Report any issues, please.