Fixed the issue.
For future reference.
Use this command line
nano /var/www/yourdomain.com/conf/nginx/ssl.conf
Then delete http2.
Save.
Then restart Nginx. ee stack restart
Fixed the issue.
For future reference.
Use this command line
nano /var/www/yourdomain.com/conf/nginx/ssl.conf
Then delete http2.
Save.
Then restart Nginx. ee stack restart